I'd remind you that when Ep1 was released, there were a LOT of comments that it's pretty much exactly the same as HL2 is. It's just a few new levels put together. Same art, same weapons, same puzzles.
Yet you won't find too many people, other than the vocal minority, that didn't like Ep1. Most people really enjoyed it, and it was worth the $20 to them. Most people don't look for innovation with every game that comes out, especially when the existing dynamics of the game already works. Ep2 has already been stated to have new environments, weapons, enemies, and engine upgrades. This should satisfy those that require these things and put the bitching on these topics to rest, at least if only for a short time.
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Currently playing Titan Quest, Prey, Need For Speed Most Wanted, and Disciples 2.