I have tested a number of hearts, spades, and other card games and this is the most solid interface I have found. The game play is better than most, but I have yet to find really strong AI. I have not seen any signs of omniscience or skewing of randomness to compensate so it is still satisfying. Would like to see the Americanized variant "Barbuda".
Ptahmus about Barbu - trick-taking card game