S3: Steve is really phoning it in...
...but Martin Short has really taken the reins. He's still just as quick as he ever was in the 70's. Steve has really taken a back seat, though - not a lot of speaking parts. And the gags (like the "white room") aren't really playing. He's really just kind of embarrassing to watch in S3. Selena has stepped it up, too, acting wise.
Big gripe: I hate when shows sell us on celebrities "joining" the cast - then those celebrities disappear 2 episodes in. The best episodes were easily the ones that featured Paul Rudd, but now he's gone. And Streep is always good - and she's gone, too. Bait and switch!