There aren't any bad episodes. Every one is easily as good as anything Enterprise could manage, and the great epsiodes are plentiful.
From season 1 alone:
33, Water, Bastille day, Act of contrition, You can't go home again, Litmus, Flesh and bone, The hand of god, Kobol's last gleaming pts1&2
10 out of 13 episodes are great. The occasional kara/lee themed episode, which I don't find all that bad anyway, is worth it for all the great ones.