I didn't play any Star Wars video games until after this game (I was never that huge of a Star Wars fan until this game!) so I have to say Wave 3. That was the last time that I recognized most of the ships as being from a movie. And even then, I didn't know what the HWK was.
I just figured that the TIE Bomber was the best ship ever, and that its unique mechanic of bombing stuff would give the Imperials a cool niche and a little bit of an edge - shows what I knew! And that was also about the last time that the meta contained mostly characters from a movie.