I am not sure what he means by "slow".
Slow in story? Slow in combat speed?
Or the overall nature of the game is slow and not bang-bang-bang?
(We don't need a DE3 where the game is bang-bang-bang; this is not Halo).
If we're talking about the tutorial level and first level (The Statue of Liberty) of Deus Ex, yeah -- the game's story and gameplay took a little bit of time to get going; once you got by those two levels, it really picks up. But, that was really about it -- b/c the game was teaching you how to play and the game mechanics, anyways. After those 2 levels, the game was at the pace it really should be at -- which was fine.
Also, those two levels should have had an option to be skippable namely for DE1 vets wanting to replay the game, anyways. Tutorials always should be made optional, if you ask me.
About combat speed, I dunno -- but what was wrong w/ the speed of the combat (when it happened) in DE1 and DE: IW?
Nothing, if you ask me. I always thought combat speed was fine.
If anything, I'd like for DE3 to have some great enemy combat AI, since combat AI was never that great in any of the DE games.
The depth should always remain in DE. The game should not be a non-stop shooter. There should be those breaks, where you reach areas where you will have to make decisions, talk to a bunch of NPC's in these areas, and all the adventure/RPG elements that made DE more than just another shooter.
Also, about DE series, the game shouldn't really force the player to kill many people, if the player don't want to. You can finish DE1 by the storyline forcing you to kill ONLY THREE people, if I recall; the rest is up to you. DE: IW was also along those same lines. So, DE3 should follow suit, too.