I find all the maps pretty fun, hydro is the worst for me though. And a lot of the custom ones are good, maybe you're just too picky.
Gravel Pit, 2fort, Dustbowl, Well, they are all pretty awesome. I'm fine with waiting for the update. I wish they'd make all the secondary weapons first then release them at once, then release maps more frequently also.
edit: Granary is awesome. Badlands is fun, just usually its fucking unbalanced as shit and people don't know how to play it. Oh well. And I guess I like playing Hydro as long as I start on a certain side (fun sentry gun locations). The one that is indoor. Hell, Hydro confuses me.