I think the worst part about the quick fix that I haven't seen mentioned (or perhaps haven't noticed,) is that it seems to eventually force both teams to use it. Before you disregard that and assert the notion that kritz destroys quick fix, consider the possibility that switching to kritz isn't 100% fool proof.
I hate to use what happened at LAN as an example because of the context that requires consideration with LAN. Nevertheless, I asked a few LAN players myself about their significant use of the quick fix at LAN, and the general consensus was that they were forced to use quick fix to keep up with the other team.
If it is arguably so, that it is difficult to avoid using quick fix against a team who is using it, then I think that blows. I don't think it's 'fun' to have to use a certain weapon just because the other team is, and thus be forced to play a certain way.
I do NOT think that the ONLY way to counter quick fix is using it yourself, but it seems that as of right now, it is difficult to argue otherwise. There is much to be considered, and it's easy to make different arguments.
I don't want to buy into the notion of "if you can't beat 'em, join 'em," and that's because I don't want to feel like my options are limited because of another teams choice of medigun.
so maybe I'm just arguing with myself on this one, but I hope we can all agree that even being forced to at least consider HAVING to use a certain weapon because the other team is doing so, is lame and not fun.