I usually see between 15-20% of flops. If I look at the stats and I'm at 30% I will slap myself in the face for playing way too lose preflop. Then again I don't normally play suited connectors/Ax suited from early/middle position which alot of good players do, so this percentage might be low for some more LAG players. Unlike the post above, when I'm at 80% of showdowns won I'm normally down a bit of money, opposed to when I'm just slightly above 50% I normally have made lots of money. Doesn't seem to make sense but that's how it always works out. Just find out what's working for you and stick with it.