As noted, played optimally on a good paying game, Video Poker is one of the best returning games you can play.  In fact, some games, with good pay tables can actually offer a small player edge if played optimally.  Here's a good general guide to playing Jacks or Better Video Poker.  

- Hold any four cards to a straight flush.
- Hold any three cards to a royal flush.
- Hold any four cards to a flush.
- Hold any low pair (tens or lower).
- Hold any four-card consecutive straight.
- Hold any two high cards of the same suit.
- Hold any three cards to a straight flush.
- Hold J, Q, and K of different suites.
- Hold any two high cards of different suites.
- Hold J, Q or K with a Ten of the same suit.
- Hold any single high card.
- If you didn’t get dealt any of the above, draw five new cards.