The top hands play themselves, my poker bread and butter comes from (no particular order):
1/ stealing blinds
2/ making good bluffs
3/ spotting bad bluffs from villains
4/ getting value from marginal hands
what do you consider marginal hands? TP? or less?

I have a problem spotting bad bluffs at 2nl. I believe they dont happen often, but then its tough to say b/c you dont get to see their cards after you fold.
What sort of things do you look for to spot a bluff?