You don't just use speed to get to places faster. On many occasions someone manages to catch me by surprise when I'm in power/armor mode and then I go behind cover as quickly as I can, turn on stealth with whatever little remaining energy I have, use the speed to sprint a short distance while taking advantage of my surroundings (using power jump/ledge grab to get on top of some structure and try to get behind the other player) or just use power jumping and sidestepping to make it harder to hit me and win the fight despite being at complete disadvantage. I have gotten some really nice triple kills by effectively doing that and I assure you speed helps you a lot in combat if you use it properly.
You're right that compared to Crysis, cloak is much more necessary in Crysis 2. However, I don't think that's a bad thing and you definitely don't have to use it all the time, only when running around in open areas. And running around with armor mode on is actually a very valid strategy if you use armor enhance and you can easily react and kill someone who surprised you from behind.
I also totally disagree with what you're saying about modules, I prefer many modules to armor enhance. Energy transfer is so much more useful for me since it replenishes 50% of my suit energy whenever I kill someone so whenever I fight against multiple opponents, I can focus on taking one out and get half of my energy back which allows me to keep armor mode on for extended periods of time, turn on stealth to confuse my enemies and sprint around or power jump around so it's harder to hit me. Not to mention that there's very little downtime waiting for suit energy to replenish as long as I can rack up kills. Proximity alarm is another module I prefer to armor enhance and it's very useful since you know if someone is getting close to you so it's very difficult for someone to catch you by surprise. Nano recharge is also useful since it restores your suit energy 2x faster than normally which means you don't have much of a downtime since you don't have to wait as long for your energy to replenish. It also doubles your health regeneration speed and halves the amount of time you have to wait till your health starts to recover which is definitely useful.
As for stealth modules, a lot of them are useful and it really depends on how you're playing. I use stealth enhance because I run around a lot in stealth mode and use nanovision but cloak tracker is also quite useful since it shows where enemies enter stealth mode on the minimap and also highlights stealthed players so it's easy to see them even without nanovision. It's useful with proximity alarm and you won't be caught off guard easily, if ever. Blind spot is extremely useful for snipers since you are immune to being seen on minimap when your opponent team has maximum radar on. Proximity alarm is also very useful for snipers since you'll be notified when someone is getting close to you so you have time to move and switch to your pistol.
Power modules also have a lot of great options depending on your playstyle. Mobility enhance is great if you move around a lot since you won't run out of energy so fast. Weapon pro is fantastic for faster reloading and weapon swapping. Loadout Pro lets you carry two primary weapons which is really great when you're using l-tag or sniper. Retriever is also very useful for sniper since you don't have to collect dog tags and you don't need as many kills for the support bonuses. Side pack is a good choice in crash site for the additional grenade/jaw and aim enhance is pretty useful for heavy machine guns. Some modules are definitely not that useful, yes, but most of them have their advantages depending on how you play, what weapon you play with and what gamemode you're playing. I have 5 custom classes and I use all of them and sometimes I switch my role in middle of the round. I think that you're making some pretty unfair assumptions about modules without really having familiarized yourself with them.
And as far as ledge grab goes, I'm not sure how exactly you manage to grab ledges you don't want to. The controls are really responsive and the new normal/power jump system is so much better than the clunky way in original Crysis. I often opt for the regular jump and ledge grab instead of power jump so I can save up energy. And sliding is not useful most of the time, yeah, but I have managed to avoid a few deaths by sliding towards someone who was shooting me (and it's been done to me) and it can be especially useful with marshall. But most importantly, it's fun. It's not the most important skill but it's really awesome when you manage to pull off a nice kill with it. Maybe you don't care for that but I appreciate it. The way the control scheme works and how you can navigate the environment is just so much fun and coupled with stealth kills I think it's the best controlling FPS I have played, no contest.
You're right about random headshots though, it happens sometimes and that sucks. There are some other minor issues with the netcode as well but you are completely ignoring the fact that the netcode in original Crysis wasn't any better.
But to each his own. I agree that Crysis was a great game which isn't appreciated enough but the multiplayer really wasn't all that great for me, and I guess same applies for most people since it died pretty quickly. I think Crysis 2 manages to address most issues I had with original Crysis in both single player and multiplayer and I definitely think it's clearly the superior game in almost every way. I do miss some of the better levels in Crysis (the second village mission comes to mind) but overall I couldn't really be happier with Crysis 2's direction. Too bad the story turned out to be pretty bad though, I was expecting way more from it.
edit: sry did some heavy editing on the post.................. ever changing post