I parted some fools from their money, so a net positive.
Excellent!!! I kicked ass at Mah jong, did ok at hears, and was destroyed at spades. no money involved, though.
The great thing about poker is that to play a "good" game against most people, you don't really need that much strategy. If you know your basic starting hands, card odds, pot odds, and outs, you are probably way ahead of anyone at the table unless it's a bigger game than your average low-stakes table. Plus people start to get drunk as time goes on and push all-in against you when you have the nut hand.