Limping with AA is never good but in a micro shove fest it works wonders. If every other hand somebody is jamming with 10 5 off, obviously it's a good play. I also think it's ok to limp in early position with suited connectors or a low PP, especially in the game formats of todays crappy online poker world. There is virtually no room for error in 50% of the games because of tubro blinds, starting stacks etc. It's worth it to limp 22 early to me, rather then raising. If you raise, Are you going to call a reraise for a third of your stack to hope to hit a 2? With the 76 suited 33 etc in early position it is fine to limp. If the game you're in has a nice starting stack or blind structure or you chip up well in the game you should always raise any hand you play. I'm not sure if you're talking about cheap online games or what. If youre talking $1 buy ins or $100 buy ins it makes a huge difference too.