The fact that its made by springfield, and the fact that they stole/bought the idea from another company. Its not even their own orignial design. Plus I just think they are boxy and not very enjoyable to shoot. Shoot a nice sig and i guarantee you will never want to shoot an XD again. Sorry if I view the .45 as a negative. Check out the stats on the .357 sig caliber. Less weight and bulkiness of a .45 plus the amazing amount of '# out of the muzzle not to mention much better accuracy and controllable recoil.
.45 is hardly a problem to control in a full frame pistol.... my .40 Glock is harder on the recoil than my brick if a 1911. It's all relative.