Smith & Wesson M&P40. There aren't a lot of guns that I don't like, but that is one.
I wanted to love the M&P. I really did. I tried the grip out in gun shops and shows any chance I got, I looked around at them, and almost bought one a couple times, but wanted to shoot one first. Well, I got my friend's new M&P40 out to the range, and I absolutely hated it. I just really hated the trigger design, the bottom half moving actually distracted me more than I thought, it was a very mushy and gritty trigger, and there wasn't much of a reset. I know, they supposedly fixed the triggers on 'em, and I shot it just fine, but the fact that it was so bad, and at that price, was a huge turn-off. The grip also didn't work for me nearly as well as Glock's grip. The Glock offers more real estate for my support hand. Overall, it was just a disappointment.