Well, I guess we're all entitled to our own opinions, SesameStreetFan.
I, for one, really liked them and it wasn't til later that I picked up how they were named after their performers Joey Mazzarino and David Rudman. Was this one of their first pairings? The two seem to be paired up a lot the same way many other performers are or have been:
Jim Henson & Frank Oz
Jerry Nelson & Richard Hunt
Carrol Spinney & Martin P. Robinson
Joey Mazzarino & David Rudman
Dave Goelz & Steve Whitmire
Sure, the Monkeys talked a lot about bananas, but that's just who they were. Maybe that's why they were written out because some felt they were a one joke act. I really got a kick out of them though and they were so cute.