I really should think before I post.
I haven't played DNF, but I have to say, after watching a few videos, it's kind of like when someone in a movie lets out a really big, obvious fart, and there's no rhyme or reason to it, and in my head I'm thinking, "Really?" Juvenile humor can be very hit-or-miss. "Ren and Stimpy" (before John K. was fired) was a brilliant example of it working extremely well. Watching Duke get ejaculated on by aliens in a DNF video just made wince, not because it was gross, but because someone thought that was funny, when it's just kind of stupid.
Okay, as far as disappointing games goes, I was definitely not impressed with Twisted Metal 4. The third game had some definite problems, so I was hoping the fourth one would be a redeemer. Instead, it had very boxy, boring level design, vehicles that you felt embarrassed to play as (like Garbage Man and Meter Maid), weird mechanics that caused wall sticking and frequent flipping over, a superbly crappy soundtrack that included no-name alt rock and out-of-place hip hop, a "freaky clown" aesthetic that felt outdated even at the time, very little in the way of interactive destructibility, a pointless and very limited "make your own vehicle" option, minimal and boring multiplayer maps, random framerate issues, craptacular ending cinematics and bland art design. Might have been a mediocre stand-alone game, but it was a tremendous failure compared to the first two Twisted Metal games, which were about as much fun as you could have with vehicular combat.