The first _is_ the worst. (I do seem to dimly recall something entitled "Star Trek V" that was worse, but it was clearly a parody.)

The episodes mentioned are all cheesy but sort of entertaining, and I'd watch them if they were on. The ones I skip are Cat's Paw (originally a non-Trek story that didn't really fit in when adapted as a Trek episode) and Assignment: Earth, which was a sort of pilot for another series and for Trek fans consists mostly of scenes with characters you don't know doing things you don't care about in an office building circa 1968.