The default stats they give you are the essentials. VPIP, PFR, AF, 3bet are the main ones you really need, and honestly when I'm playing, I mostly just look at VPIP and PFR.
VPIP = how often they are voluntarily putting money into the pot. So if a player's VPIP is 55, then they are seeing 55% of flops. Most good players's vpips are around 15-28. Once you're playing around 25-30ish%, then you're playing LAG. 22ish and less is TAG. Fish start at around 30ish, and anything above 50 is a clear-cut fish.
PFR = how often the player is raising. At 6max 0-15 is nitty. 20-26ish is LAG. Anything above 30 is pretty maniacal.
AF = aggression. 0-1ish is passive. 2-3 is aggressive. 5+ is really aggro.
3bet. 5-7 is pretty normal for regs at 6max. 4 and less is kinda tight. 8+ means a lot of light 3betting.
You should also pay attention to a player's 'attempt to steal' and 'fold to 3bet. ATS will show how positionally aware a player is. A player's PFR could be 20 overall, but if his ATS is 40+ it could very well mean his EP PFR is 10 (tight) and his BTN PFR 60 (loose). In summary, you'll need to look at positional PFR to see how often a guy is opening from EP, for example, because he may not be as loose from that position as indicated on the surface.
'fold to 3bet' is helpful because someone who calls too many is probably fishy or at the very least someone is trying to outplay you a lot. 60-75 is a normal fold to 3bet for a regular. 75+ means they fold to too much of them, and below 50 means they don't fold enough to them.
WWSF, WTSD, W$SD are also helpful.
http://archives1.twoplustwo.com/show...n=&page=0&vc=1 3rd post
http://archives1.twoplustwo.com/show...Number=4946669
http://www.boards.ie/vbulletin/showt...p?t=2055197237
http://forumserver.twoplustwo.com/69...ff-long-98959/