Eh, I don't mind it. It don't think it'll kill immersion for me.
Most people like Minsc and Boo, so I don't see how this is any different.
The difference is that Baldur's Gate didn't have a whole lot of humor. Minsc and Boo were one of the very few pieces of comic relief in a series that was otherwise pretty grim. D:OS on the other hand already has quite a bit of humor.