R. Star wrote:
Well half of DS9's first season was dedicated to pointless and unnecessary appearances by chars from TNG to bring over the fanbase.
The one episode discussed had Q and Vash, then Lwaxana Troi in what would become a recurring plotline. That's it. They did do a crossover episode with TNG, but AFAIK Bashir was the only DS9 character to show up in it.