I personally have no issue with it, although if someone wants to dress as an anime character while going to the grocery store I might raise an eyebrow. Apart from that, those Comic conventions and Halloween are perfect times for people to do that sort of thing.
Speaking of good cosplay, here's a link:
kelldar.com
(she's got the body to pull off the sexier costumes, IMO.)
(actually, I wish she would pull them off!) 