Oh yeah, I understand some of those complaints. Probably my biggest complaint about Deadly Shadows is the huge drop in size of the levels, but they're still decently lengthy. It was one of the least disappointing sequels ever, if you ask me, as it could have been a lot worse. But yes, going back to the size of the levels in Metal Age with the atmosphere kept intact and (For me) a healthy amount of paranormal stuff thrown in, all with better design and visuals, would be
brilliant. But I'll wait and see how they do with Deus Ex 3 first. If that comes out good, I'll be all the more excited about Thief 4.
As for the cover stealth in DX3...I won't mind that much as long as they provide plenty of places to take cover. If shadows aren't going to play a role, then a stealth character needs much more in the way of objects to hide behind, otherwise stealth will just be pointless and frustrating. It all depends on how they design it. Does lack of shadow hiding still piss me off? Yes, because that's a feature that
all games with stealth should have (As well as a stealth "bar" for those in-between levels of lighting), but I'm willing to forgive if they work well with what they have.