Not all of them are entertaining, though. Tobi is annoying about 60% of the time, Sheever is annoying 110% of the time.
Honestly, I feel like LD+Winter set the high water mark. They more or less know what they're talking about, and they say goofy things occasionally without trying to FORCE enthusiasm or excitement.
Closest I've seen to Tastosis in Dota, anyway. I wish I could understand what v1lat is saying; I've listened to his casts when there aren't any decent English announcers to listen to and he sounds like a funny guy