UNDERRATED:
Makarov (yeah, I know they ain't perfect, as some have mentioned before, but they are fun). BTW, I've about had my fill of people mispronouncing the damn little thing--it's pronounced Mah-KAR-ov, not MAK-er-ov. Oh, why do I even bother?! You say ta-may-toe, I say...hmmm, I say it that way too. Just call the Makarov whatever you damn well want.
There, I feel better now.
5-shot revolvers for CCW (obviously not a semi-auto, but I thought I'd slip it in).
OVERRATED (by the gun-ignorant):
Smart-gun technology.
DAL