I'm going to do one from each season, make things a little more up for discussion:
Season 1 - The Passenger
I'm sorry but this episode should have gotten 1 star. The acting is so bad that it's almost as laughable as some of the TNG episodes from their season 1.
Season 2 - Rules of Acquisition
Yeah it's dumb, but I would give this episode 3 stars now that we know the Farengi story
Season 3 - Prophet Motive
Maybe I should make a thread about this episode (it's not talked about very much) but I've always enjoyed it. 3 Stars
Season 4 - Indiscretion
I love this episode and consider it one of the most underrated episodes of the series. This was the first of Dukat's softer side episodes and really added to is uniqueness as a villain at the time. I would have given this one a 3 and a half, especially for the prick scene alone which I laughed hysterically the first time I saw it.
Season 5 - Let He Who is Without Sin
I don't consider this episode the worst of the series. In fact, I consider it more average, which probably already puts me in a minority. 2 Stars
Season 6 - Who Mourns for Morn
I actually don't disagree with any of this seasons rankings, but I would have dropped maybe a half star on this episode. Talk about an unnecessary episode exploiting a pretty decent series in-joke.
Season 7 - Extreme Measures
I actually thought he was way too harsh on this episode. I liked it better than the first 2 episodes of the final chapter, especially the Winn/Dukat moments.