>>6020929All of them are good molds hampered by varying QC issues.
Skullcruncher's typical QC issues are loose thigh swivels and loose hips, fixable with futureshine.
Weirdwolf's back cockpit hinge can just up and break. Can't be fixed really, and it's a straight up QC issue. You'll either have it or won't.
Sentinel/Astrotrain has some potentially loose joints, again, futureshine should fix. Both have a SUPER FUCKING TIGHT headmaster connection port though, and the only way to deal with that is to turn the headmaster's head so it's face is facing the face on it's back. Otherwise you might end up breaking something, and your first time pulling the head off them is going to scare the shit out of you.
Soundwave has a gold paint rubbing off issue, Blaster has no real issues except for possibly his base mode fold out gun being a bit floppy.
Scourge and Highbrow have floppy heads due to their head port design. This isn't a QC issue but an actual design flaw, but you really won't notice it when they're posed.
Mindwipe, Brainstorm, Blurr, Chromedome, Hardhead, have no QC issues I know of.