Some diversions and jokes may be funny in SRIV, some missions may be over the top. But some important things where funny the last time in Saints Row 2.
-homies aren't funny anymore(near no dialogues, AI from hell, ...)
-NPC aren't funny anymore(near no dialogues, bad AI)
-enemys aren't funny anymore(i mean, is a single alien enemy better than the Ronin , Brotherhood and Samedi with own cultures and dialogues?)
-car driving isn't funny anymore(bad driver AI, i think, that there is only one AI for pedestrians and drivers)
There is no point at all anymore to stay in some place and watching the funny chaos, eg. an old lady in fight with a big Brotherhood homie, cheerleaders fighting Samedi, ... Or have you heard a response like "If you like us, why you are killing so many of us?" in Steelport, if you give a compliment to cop?
Some things may be improved in SR3+4, but Steelport lacks the fascination and deepness of Stilwater, it's a better mingame collection.
Two of my SR2 gameplay videos, maybe you can note, that Steelport is prettier than Stilwater, but dumbed down as hell. SR2 was slow food and i loved it for that.
www.youtube.com/watch?v=i2B9i2TYTqQ
www.youtube.com/watch?v=gvuXlrLBCjk
I mean, i have problems with the setting of SR3+4, but worse is the lack of deepness and quality.