In my very humble personal opinion, I don't see an abitrary, universal, absolute standard of what is or is not a legitimate process for making music. There are things I would view as "cheating" for me that someone else might view as legit and vice versa. Some things may be commonly viewed as cheating (lip syncing in live gigs, for example), but there are no rules. In the end, it comes down to a matter of taste, which is very personal.
It's fine for one musician to decide that they will not use pitch correction or timing correction in their recordings. I don't think anyone would argue with their right to do so. I think many people would object if that musician were to attempt to apply their value judgement to other artists. That's what I think we see here.
Is pitch correction a bad thing? I don't like it. If someone else wants to use it, that's fine with me. How about Audiosnap? I'd rather not go there, but it doesn't bother me if someone else uses it. What about quantitizing MIDI data? Depending on the track, I've done it. That's not cheating in my eyes. How about using sampled guitar sounds instead of a real guitar? If it works for the track, I've got no problem with it. Loops? I don't use them, but others are welcome to do so. Playing live with triggered MIDI sequences? It feels like a cheat to me, but some are fine with it. Playing live with pre-recorded background vocal tracks? Seems quite "cheaty" to me, but I understand why some do it. Rap over someone else's song and claim it as your own? That seems like a huge cheat to me, but it's the origin of all rap music.
The bottom line is that none of us are in a position to lay down the law and say that certain techniques or tools are or are not legitimate. We are in a position to state our opinions about such things. If we can contain this discussion to our opinions, we can have an interesting dialog.