Simply put, Think of Star Wars as 3 levels of pure gold, and ESB as 4 levels. 3 are pure silver and 1 is copper. You start on the Hoth Droid level, its cool and adds to the original story, then you go to the AT-AT walkers which is by far the best of the 4. Its super cool and has a real feel like your in the movie just like the first level of SW. Then you have the Tie Fighter battle. It feels more like a rehash of the first Star Wars fighter battle and you don't have a Death Star to blow up later, but I think the A.I of the fighters may be better. And then you end with the asteroids level. Yes, there is nothing to do and yes, it can be annoying, but it is also very challenging. And if you think about it, its pretty much like the movie. A fairly anti climatic ending. Maybe someone here could have thought up a better 4th level or even 5th level. Fight some droids, fight some AT-ATs, fight some Ties, and then what? Land on cloud city, get frozen in carbonite, have a lightsaber battle with VADER and inevitably loose. Either way you go, there isn't much of a good ending. So I say, if you like Star Wars, you'll like ESB. But personally, I would have liked to seen something like the Donkey Kong 2 project. Someone program a speeder level, an AT-ST level, A space attack level with the M. Falcon, and an internal Death Star battle. Put all 11 levels together and bam, you have the Star Wars Trilogy v.0.0
And one final thing of interest in ESB, you are piloting 2 different types of ships. The hoth snow ships and the millennium Falcon. The X-wing had a much better screen presence than either ship in ESB. But its still cool that they got programmed. But hey, that's just my 2 bits.