I don't entirely agree - if you want to be use Snatch as an opportunity to completely turn the tables on your opponent, then Spiritomb isn't what you want. Obviously that's a riskier strategy, but netting a Shell Smash can be a great move.
Snatch+Baton Pass could be pretty nifty too:
Absol
Ambipom
Huntail
Mew
Mr Mime
Spinda
Though no particularly great users, especially when many of them either suck or don't need Snatch to be deadly.
The thing with Snatch is that it seems better as filler than trying to create an entire strategy around it, though the Spiritomb idea is nice. Simply having Snatch on your moveset as your opponent brings out Cloyster or Iwaperasu is wonderful.
The problem is that if your pokemon poses an offensive presence, they'll attack you rather than setting up on you. No one's going to set up on an Absol that could put a huge dent on your set-up poke.