Metamorphosis is a must episode. It's the second ep of the series, Lex meets Lana, ther're are interesting triangels and the creators where just getting their footing with the FOTW stroies.
Bug Boy was actually one of the better villians, a great contrast for Clark, there was that connection and the complexities of meteor rock poisening and it's like how can you not level with the second ep?
Lucas was a 2D character paired up with a 3D Clark. Sure there was the whole "oh look at me, I gots da wierd K powers. Look how I can cause Clark problems" and it was new, as the FOTW had not become old school yet (like during the rest of the season) but give me a break. There was nothing in Metamorphosis that could not have been done backdroped against a better episode.