It's easy for me to see why Vic became popular with the crew, he's just that cool.
I strongly disagree about "Bada Bing" and "Holosuite" being among the series worst. They're both necessary lightweight episodes for a series to help provide some needed relief in a pretty dramatically heavy season. I especially enjoy "Bada Bing" as an Ocean's Eleven riff, which was originally meant to precede immediately before the Final Chapter arc as it's the last time we see the characters truly loosen up.
I also thought Ezri was an interesting addition to the show. It was unfortunate that Ferrell left, but I thought the writers were in the right to take advantage of the opportunity to let Dax live through someone unprepared to carry all the baggage. There was obviously a lot of focus to bring in a new main cast member, but I never thought it was intrusive or taking time away from other characters because as much as the episodes were about Dax they were also about how the characters felt, and that's always been an important aspect of the show: the crew dynamic.
The only episode of the season I truly dislike is "The Emperor's New Cloak". It's a very flat finale for the "Mirror" storyline.

I also thought Ezri was an interesting addition to the show. It was unfortunate that Ferrell left, but I thought the writers were in the right to take advantage of the opportunity to let Dax live through someone unprepared to carry all the baggage. There was obviously a lot of focus to bring in a new main cast member, but I never thought it was intrusive or taking time away from other characters because as much as the episodes were about Dax they were also about how the characters felt, and that's always been an important aspect of the show: the crew dynamic.
The only episode of the season I truly dislike is "The Emperor's New Cloak". It's a very flat finale for the "Mirror" storyline.