I was playing 2 tables at 25NL and moved up to 3 recently. It was a little hectic at first but after 10 minutes it was almost the exact same as 2 tables. You need poker tracker and PokerAce or GameTime+ to make it easier to peg players. The more tables you play, the less lkely you are to play junk hands as mentioned. This is a good thing and probably a reason I am doing well.

I actually didn't start making money until I went to 2+ tables - probably because one table bored me and I played too many junk hands. I'm always up on one or more tables, so possibly being down on one doen't affect me as much when I'm up overall.