I did try 1.d4 2.c4 again over at ICC in 15 minute games and got absolutely crushed. It is harder over there, as the range in rating of one's opponent is not someting I can select, at least not in a rated game. I've played against guys as much as 500 points over my rating. So for chess.com Live Chess and especially ICC chess, I'm looking into 1.d4 systems.
It's true if you play in the pools, but you can send an open seek - ie. seek 20 10 1200-1400 r or anything you want.
If someone is rated U1600 on ICC, they are still weak on tactics and you can exploit that. Take a break and watch some of the games played between 15xx players there. You'll start seeing that they make pretty big mistakes too.
"pretty big mistakes" ? Why do I sense that somebody's been watching my games? lol Seriously though, I'm often astonished that players around this bracket (1500ish on ICC) seem to miss mates as often as they do. I watch a lot of blitz games over there and find mates during games that 1800+ players are missing, and believe me when I say, I'm terrible at blitz. Not sure why many are missing simple mate patterns like that. Maybe they're playing TOO much blitz or something?