I won $300 at Harrah's playing No Limit for about an hour once. Friend busted out so I left.
Won $180 on quarter slots at the Venetian when we were walking through. Sat down, put a quarter in, and bam.
I've never lost playing Roulette, but I've only played once, and I stick to one rule:
ALWAYS BET ON BLACK.
A great shot is when you pull it off. A smart shot is when you don't have the guts to try.