D20, being level-based, meant that you'd go around whacking lone kobolds for weeks and then one day *BOOM*, you're lvl 2 and now you're twice as strong! Go kill an Orc or two with your new, magically-appeared ranger skills!

I'm not too familiar with D20 (at least it's Pen & Paper versions and non- D&D games), but I don't really like its use of skills or feats and such. Kelly's right; it's not very good variety at all.
Maybe I should whip out my old colonial starfighter militia campaign I made in highschool and run something with 4 people online or something. i'd have to refresh my memory on the rules, but I'd be great to use a MB or chatroom to link to photos, take time to posts descriptons and re-check stats and rules... good fun.