The Glock is PLENTY accurate.
I somehow missed this post when I posted above. Sorry but I disagree that a Glock can compete with 1911's and with most Sigs in fact. I don't think most people believe they are as accurate as some other guns because they are built to be functional in all conditions. That means tolerances that aren't as tight as they could be and that means less accuracy. Show me a Glock that will shoot 1" groups at 50 yards and I'll believe you. If you're asking if Sigs will do this some were designed to do just that.
From the Truth About Guns web page
The P210 is renowned for its accuracy. The design specs calls for every P210 to be capable of putting five rounds into a 2 inch circle at 50 yards before leaving the factory. As with some of SIGs higher end pistols, a test fire target is included in the box.
AFAIK no such claims were ever made about Glocks. And yes Sigs can shoot this well. The new Sig P210 Legend is supposed to do a 1" group at 50 yards before leaving the factory. My P220 will do 2"-3" at 50 yards from a rest if I practice up a good bit before I try it. I've shot 2" groups with it from that distance. It won't do it every time but then I'm not the best shooter in the world either.
Don't get me wrong. I like Glocks. I started to buy one once. I had it in my head that I was going to buy one and I had the money in my pocket. But I couldn't find one that fit my hand well so I ended up with something else. I also came very close to buying a 1911 once. I tried to hand the money to the guy who had it and I was paying more than it was worth but he wouldn't sell.
Now I really hope we don't have to hash out every single point. I think you'll find it's common for people to believe Glocks are not as accurate as Sigs.