I'm totally on-board w/ the notion that a lot of irresponsible driving caused a ton of the tranny issues you hear w/ WRX's. At the same time though, they could be better.
Helical gears are actually stronger than straight, it's that Helical just produces a lot of thrust load (spread shafts, crack case, break gears). I ran a 1st-5th straight cut gear-box from PAR Engineering in Australia on my Mazda, w/ needle roller conversion. I broke multiple gears and in separate instances. It was terrible, and I'm still not 100% sure what happened, but looked like long term "pitting" caused weak spots on some teeth. PAR would not warranty my gears because I could not prove that I used NEO Synthetic 75w-90HD, w/ strict 5,000 mile change intervals for daily driver duty. Pissed. Sounds like PPG have a good rep though.