The worst 2005 game I actually played this year has got to be WWE Day of Reckoning 2. (Yeah, I know about Wrestlemania 21 on X-Box. Thankfully, I never touched that piece of trash.) It's like they found every possible way to butcher every good or semi-good feature of past wrestling games all in one terrible title.
Poorly-implemented ripoff of the Fire Pro stamina system? Check.
A match pace more unrealistic than the early days of Smackdown 2? Check.
Longer CAW load times than any PSX-era wrestling title? Check.
The worst 3-way and 4-way computer AI in wrestling game history? Check.
A special meter that fills up five times faster than it should? Check.
Horrible collision detection and moves that awkwardly home in on opponents? Check.
I could really go on.
The awful facial expressions that prevent you from creating the types of characters who wouldn't scream at the crowd like generic rock stars. The way flying moves never connect against any half-decent opponent. The fact that, even given four years, they still haven't managed to figure out that people want to be able to select height/width/etc. for their CAWs in inches or centimeters, not nondescript imaginary measurements.
Every single year, a whole group of gamers proclaims some wrestling game to be "the next No Mercy," then about half of them backtrack on that statement within two or three months. It's almost getting to the point where even if someone eventually does make the next No Mercy, I'll never know about it because I'll be so disillusioned that I'll think they're just lying again.