Nothing on them is "bent". The front sight base can be canted, ie it is not installed on the barrel perfectly straight up. This causes no problem other than cosmetic, since the front sight post is moveable for windage this just means once zeroed the post will be off to one side or the other slightly. None I have heard of were out of spec enough to not have enough adjustment to zero. If it bothers you you can remove the pins on the front sight base, rotate it to the correct position, redrill the pin grooves and re-pin it. Or you could use a replacement rear sight that adds windage adjustment too and even out the windage adjustments between both the front and rear together, would look less "off" than the front post being off center badly in the hood or whatever it's called... The cant section on the website listed above displays better than I can explain I'm sure:
http://linx310.nothingbutguns.com/cant.htm
The "bent" carrier problem is actually just the gas piston not being mounted correctly, and is rare anyway. For some reason the US gas piston is tightened all the way down on the carrier on the SARs, and is either welded or pinned tight. You are actually supposed to run the threads down till it's tight, then back it back off 1/2 turn or so and pin it there. So that the piston has some "slop" and can move slightly. You could remove it without much work and reinstall, but frankly that causing conflicts is pretty rare anyway. It would require a pretty out of spec canted gasblock for it to be a problem.
Trigger slap can easily be fixed with a file or a dremel if you have one. Disconnector just needs a little clearancing on the back/bottom. Not a big deal at all. Or you can outright replace the trigger group with a better one for $30 (or $60-$80 if you want a fully adjustable trigger setup from Power Custom/RedStar Arms).
I have a pair of SARs and both are 100% straight, have not had a single malfunction in over 4000 rnds between them, and have zero trigger slap after 5 minutes of attention from my dremel...
They are as accurate and rugged (possible exception the Century fire control group, supposed a little on the soft side metal wise) as any standard AK. Mine shoot better than my previous MAK90s. Really love my SAR2 in 5.45x39
Here's a pic
www.inter-scape.com/ray/sars.jpg