3 Card Poker Anyone?

Has anyone played this game and had success. I tell you what it is almost as addicting as poker because the payouts can be absolutely amazing. It's hard to explain the rules, but for those who have played it understand the rush of the game. When I was on a cruise I actually called my straight flush after just looking at two cards (let my neighbor flip the last card since we were having a good time win or lose). Then I was dealt trip's right after a guy left his seat and I sat down, and got trip's another hand after I declared to everyone this would be my last hand. It's a pretty sick game. This is allowed right... being it is poker, no?