It was fun at first, but it multiplies a lot of the flaws of open world games by making the side activities rather mindless and boring. It also suffers from a moral ambiguity that makes the lead character unlikable and leaves you questioning your own sensibilities about 30 seconds after you get into a gun fight. Just to make my playthrough less jarring, I actually had to carefully choose who to steal from for money, but since you have to steal to make any money anyway.. you still feel like a terrible person.
All in all, gameplay is fine, but the story makes it rather lack luster.