There are certain limits and limitations. There is a certain amount of crazy that a movie can just waltz throgh without losing the viewer. And while the first movie was not an instant classic, it was fun in certain ways (even if also very silly). But silly is being taken to a whole new level here. To a level that is breaching quite a few lines (of good taste).
Even if you think you don't care about good taste, when certain lies are being said that lead to painful penetration without any repurcussions, you may start wondering how small minded the characters are. Add coincidences and other small "missfortunes" and this just hangs by a thread, swinging from one disaster ("comedy skit") to the next. It tries not to be racist while exploiting cliches, but whether it succeeds in that or not (I'll leave that up to you), the emerging "jokes" are not really worth aynthing ... it was quite a waste of time and a lot of sighing while watching it. Don't be like me (I have to finish something I started) and just don't waste your time on this. I like the actor who plays the main character (Herr Lehman is a movie he's really good in), so I guess he needed the money and who can really blame him? Still doesn't make this any better really ...
