I've shot a lot of the newer polymer guns like the XD, FNP, Ruger SR40, Sig, Taurus, and S&W. I thought all of them shot well. The SR40 with the rounded backstrap side out felt the most like a Glock to me.
I've been shooting for 30 years, and 29 of those were spent shooting 1911's, Browning Hi Powers, and S&W revolvers. I tried a Glock about a year ago and found it shot great. I actually find the grip angle comfortable and prefer it to the 1911 ergonomics. The only guns I think surpass the Glock for feel are the Browning Hi Power, and the CZ SP01.
The thing I like most about Glocks is the plain, minimalist appearance. I know it's not completely true, but the Glock looks like it has only what needs to be there to function, without extraneous milling or affectations aimed at following some modern trend (like forward cocking serrations). I think the other companies go to far by adding lots of bevels, serrations, curves, and "stuff" that are purely aimed at making the guns look cool. If that's what you like, great. I simply want a gun that shoots well. Granted, most of these guns do shoot well, but the added aesthetic flare looks garish to me, now.
I have to say the one that appeals to me the most after the Glock is the Ruger SR40. If they would make this in 357sig, I would buy one right away.