Matewis: Definitely
Command & Conquer : Renegade. The idea of experiencing the C&C universe from a 1st person perspective was incredibly exciting. What I expected, or hoped for rather, was to be a soldier on a vast C&C battlefield where 2 or more bases where battling it out. What I got instead was a mediocre FPS with a C&C theme. The only redeeming feature was the multiplayer, which was closer to what I hoped for, although on a much smaller scale.
Did you ever try
Spinter Cell : Chaos Theory? It was released one year or so after thief 3 and I thought it was pretty damned good.
tinyE: I also thought Riddick had some nice stealth stuff, though it was very limited. In fact I think the 'sneak up and neck snap' is the best stealth kill in gaming to this day. I replay those parts over and over. :D
It does indeed have some nice stealth-y bits from what I've played of it (about two hours into it). Shame that Riddick is so brittle compared to everybody else, and I can't get quicksave to work. Dishonored has some great stealth-y bits and so do the Batman: Arkham games (though the maps/rooms get a bit repetitive).
On topic: Gothic 3. I love Gothic 3 but its execution is massively flawed (mostly on the engine side of things). A completely open world game with a map that rivals those of The Elder Scrolls series? A war between Humans and Orcs where you decide the fate? Not a single invincible anything present in the entire game? The ability to be "the bad guy" or "the good guy" instead of being forced to the "good guy"? Interesting, varied and beautiful areas to discover? Multiple ways to build your character and tons of loot? Yep it promised and indeed has all of that. It also has a completely broken engine, tons of generic MMO fetch/eliminate quests, a main quest that is so absent you can literally completely forget about it and oh did I mention the completely broken engine that makes it nearly unplayable?
In short it promised a huge completely open world that you could actively decide the fate of (either good, evil, or neutral) with hundreds of hours of gameplay. It delivered that but in the most broken, nearly unplayable way possible. Given another year of development time it might've reached its potential, but the standalone expansion Forsaken Gods would've still killed the Gothic series (with Gothic 4 dancing on its grave).