Has Conan O'Brian gone completely downhill?

[MasterShakes]

I absolutely loved his show, but lately, every single time I turn him on, he has this same basic rotation of jokes (with different variations of course):

Star Jones is fat.
Reuben Studdard (sp?) is fat. (I find it absolutely astounding that anybody is still making jokes about this guy)
Michael Jackson is strange.
George W. Bush is dumb.
Kirstie Ally (sp?) is fat.

The man needs to hire new writers. It seems that he has inherited the Tonight Show, and he's already lowered his jokes to that level. I'm not saying that the above jokes are offensive (though I'm sure they are to those people and the people who know them personally) - they're just not funny. It's the same stuff every night. From everything I watched years ago, he seems capable of being easily the best late night show there is. Maybe losing Andy Richter did it, but I think he's capable of being funny without Richter.

Am I wrong?