Unprofessional is the only word that fits. "Color commentators", obviously, are a little more animated and bias, but this guy was just plain insulting and came across as a complete dick. The other guy (Donovan) did an admirable job trying to keep the conversation on point, but he had no chance of making it a legit broadcast with Kosar CONSTANTLY whining about how the Rams' QBs weren't taking advantage of coverages, and how the receivers were awful, and how Clemens turned his daughter into a porn star (my embellishment).
You don't often hear commentators say the things he was saying (e.g., saying the receiver's parents should be embarrassed, and how Clemens is so awful) . I was going to make a compilation video of all of his inappropriate comments throughout the broadcast, and even have it queued up in my video editor, but I really don't feel like re-living it again. The guy's an embarrassment - plain and simple.