My sis has a foundation bred QH, 14.3 hands and chunky as a bulldog, gorgeous little QH head. She rides in anything she's eligible for and the horse can handle, which puts her in the WP ring with some 16+ hh QH's. They hold their own and rake in a few ribbons every summer. I'm personally partial to the foundation style, smaller and bulkier, in a QH.
I think we're seeing a diversion in strains of QH now, much like in the Morgan horse world, with "old" and "new" types. I have no problem with different types within a single breed as long as the judges don't discriminate between types at a breed show (or any show, for that matter.) An issue that I see lies in a QH halter class, where horses are judged according to similarity to breed standard. I don't know what the exact wording is, but I would think that that standard is most similar to the foundation type. If this is the direction AQHA wants to go, some changes need to be made, and acknowledgement of the different types, and accomodations made in the breed descriptions for classes that use these standards to judge against.
A stubborn horse walks behind you, an impatient one in front of you, but a noble companion walks beside you ~ Unknown