Keystone created very simple, but so beautiful (gameplay and graphics wise) maps - Debrecen and Pripyat. Slashbot's Orel (and especially LdG version) is also a great map.
I really like Slyk's TW, Elnya, Klin and Berezina. Elnya is one of my top-favourites now
Dreck's Lazur is a urban masterpiece.
Vidzeme looks and plays good; so does KrasnyjBor.
Nestor's Mahnovo is a great map - I'd play it now, but most of the servers don't have it
I really had a blast when both teams knew what were they doing - I just can't wait to try out Dofinovka.
Also, guys, remember Kuzernki? That map is on par with Mahnovo - it has terrific gameplay, if teams consist of normal players. I've modified it with Stug3B, but not sure if it's right to upload it somewhere - I had no permission of ViViD to do that.
I've never liked PariserPlatz, so I haven't played it for long time ago, but yesterday I gave it a look on an empty server- man, it has changed a lot!
So I'm waiting to test it on a full server - there are good chances I'll like it
Also, Kreigstadt. Mega-map, can't wait to try out Beta 3!