I recently downloaded the demo of R.U.S.E. from Steam.
For a new 3D game, it runs fairly decently on my crappy laptop (1.66Ghz Core 2 Duo, 2GiB DDR2 RAM, GeForce 8400M (128MiB dedicated with 128MiB shared), Windows 7).
It's a lot slower paced than, say, Command & Conquer, but it's more to do with the fact that you don't have virtually infinite funding for infinite units and base structures.
I tried playing it as normal, but tanks I sent to secure some areas were getting destroyed before they could get to their destination and be of any real use, but when I started using the ruse abilities to speed up my units and to send out dummy tanks, things started to go my way a little more.
R.U.S.E is based around World War 2, with the battles taking place on a table top planning map like you often see in old movies (you can zoom out to see it as counters on a map, or zoom in to see the action in more detail), but it also has some weapons in it which were being designed during WW2, but which weren't actually put to use, such as an artillery gun with nuclear shells (think Fallout Fat-Man, only bigger

).
I thought about buying it for the PS3, so that I'd actually get some use out of it, but I'm waiting to see how it fares when teamed with Move before I but either (Move doesn't come with any games over here, which kinda sucks, but so do the release games as far as I've been made aware).
I probably shout hate the makers of R.U.S.E. for being French surrender monkeys, but they have made something playable and they use my personal preference in terms of programming languages, which is Object Pascal (Delphi).
Halo: Reach doesn't really interest me that much.
I'm not a big Halo fan despite playing every console game in the series other than the full version of Reach as well as the Halo 3 and Reach betas O_o
I probably enjoyed ODST the most as you didn't play as some super powered faceless cyborg death engine, meaning you couldn't just run at enemies with all guns blazing.
The Reach Beta for me was just 5 people going "Hey look, JETPACKS LOEL!!", me playing it using the new powers just to get to the action from time to time and one guy just sniping the 'tards too busy flying.
Also, if they had the whole super shield, jetpack crap at the Fall of Reach, then why didn't they make any of it available to any of the spartans or ODST seen in other games set later into the Halo history?