For me, at least right now, mostly I'm looking for three things:

*Number of players. I prefer Full ring and rarely come into a table with less than 6/7 people. Preferably I'll look for a table with only 1 or 2 seats open.

*Average pot size. Being at 2NL I need to make sure the table I'm going to isn't going to have 10 people with $0.10 at the table waiting for a hand before going all-in. The bigger the a.pot size for this level the more likely I'm going to have a few $1 stacks to play with.

*Flop percentage. Again, at this level at least, the lower the "seen flop" % is the more likely I'm going to find a bunch of tiny-stacks waiting for that AI moment.

I don't know about higher up the levels because I know feel and stack sizes/style of players can come into play when choosing a table but I don't have that worry yet. I don't think.