I actually started playing this a couple of days ago, pretty good concept for a mobile game. Reminds me of all of the drug games they created on the TI-86 calculators.
I play most FB games quite well in the Bolt Browser. They look great! Mob Wars, Mafia Wars, Dragon Wars, Vampire Wars, Street Racing, etc... Only ones I cannot get to work are Battle Stations and Scrabble, I guess they are too Flash-heavy.
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I recently started playing Mafia Wars, as well, and have had no problem accessing it through the Opera mobile browser. The only thing that you miss out on the is seconds countdown to your next Energy/Stamina/Cash infusion, and I've noticed occasional bugginess when trying to buy property (sometimes it will buy the property above the one you are trying for), so I've just stuck to only buying when at home. But I've had zero issues with fighting, robbing, adding members or doing jobs, which is really all I care about when on the road, anyway.