

Do you mean Thief: Deadly Shadows? That was the 3rd game in the series, and from what I understand it was pretty well received. The orphanage level alone is so highly regarded that it has its own Wikipedia page.
Now the 2014 reboot, just titled Thief, that was so poorly received the it basically killed the series. It might have been a decent game, but it was not a good Thief game.
I must have missed that negative sentiment entirely. I played all three and had no complaints. Did some searching, and apparently a lot of the gripes were related to levels being cut down in size / broken down into pieces to allow for a console release (strict memory requirements). Also I think they changed engines for the 3rd game, or at least a lot of people complain that movement and controls were worse in DS. I guess ignorance is bliss, cause I enjoyed them all.