There really isnt anything wrong with a glock. they are great guns.
Some guns fit different people differently. For me, if I close my eyes, start a low ready, then present the weapon, I will open my eyes, and the muzzle will be a few degrees up from what it should be. If I do this with a 1911, an XD, or an M&P for example, the sight picture will be lined up properly.
If the gun fits you naturally, and you're comfortable drawing and firing it, then stick with it.
There is a glock/XD rivalry, but its no different than two high schools football teams from the same town. Other people like metal guns, and still others think that revolvers are the way to go. I consider a revolver to be quaint, antiquated, and lacking in capacity.