You know, "Tattoo" is one of those episodes I just never got around to seeing (though I've got it on VHS somewhere). I think I can live with that.
The sad thing is, the B-story is the best Kes story ever. She's downright devious, in a fun way, and the interaction between her and the Doctor is terrific.
It's too bad they had to include it in what's easily my least-favorite episode of Star Trek ever.