While some found Deadly Shadows to be a disappointment, some fans found it to be an excellent game with some flaws (SHOCK SHOCK: even fans of the original games). I accept the difference of opinion.
HOWEVER, I can't comprehend how some of the former fans are capable of COMPLETELY forgetting all the flaws vanilla T1 and T2 had,while whining and crying about all the horrible things that T3 brought to the series, how it RUINED IT! I would have sympathize if T3 was to Thief series what Fallout 3 was to Fallout series. That, in my opinion, did not happen.
Nobody ever mentions the TEDIOUS and HORRENDOUS cave and dungeon levels in the first two games, the biggest offender being T1 of course. Not only were those levels incredibly ugly even by the standards when the game was released, they also featured level design that I'd expect from a highschool fanboy. Like someone in another thief thread here pointed out, the best levels in the original games were the mansions\castles (I would throw in the banks as well!). Everything else was usually a disaster.
Sure Deadly Shadows made some poor choices (climbing gloves instead of rope arrows, ugh -EDIT: I remember reading something about the developer having some technical difficulties in implementing the climbing mechanic, or is my mind making up that justification?) and was limited by the console limitations which made level size smaller, but it still was a great game, no matter how you feel about the originals. And it avoided the curse of those cave levels from the original quite nicely and executed them much more professionally.
I don't worry about T4 ruining anything or thinking it would be better if it never came out. Being a fan of the original games as well I am perfectly capable of enjoying the game should it not stray too much into action generic crap that the usual modern games go for. For all of you who feel it would've been better that T2 was the last Thief ever made, I really don't see what you're all getting upset about? Play and mod the hell out of the old titles and stop worrying about a new game ruining the franchise and let everyone else be excited by the prospect of some fresh taffin' !
HYPE!
PS: I'll eat my words and let you tar and feather me should T4 turn out to be a disaster.