R. Star wrote:
Picard in Emissary ring a bell? Not to mention Lursa and B'etor from Past Prologue too. Then Quark shows in TNG when they're after them in a later episode. For that matter, the whole O'brien character's being cast as a regular was probably influenced by giving TNG fans a familiar character.
So 4 out of 20 first season DS9 episodes feature TNG characters, aside from the O'Briens who were regular cast members. That doesn't seem like 'half the season' to me.