Do you remember in Space Seed when they're on the Botany Bay and the air pressure or whatever is about to kill sleeping Khan but then Kirk breaks open the glass and saves him? I wish that when Marcus was on the Botany Bay Khan just died and have Harrison say something like "we lost our leader when they tried to wake him up, thankfully I didn't suffer the same fate." People would be pissed that they killed Khan off screen but hopefully they would understand why, Khan's already had his day. Really I feel like the only reason they called him Khan was so Spock could yell "KHAAAAAAAAAAAAAAAAAN!" though of course even that scene felt out of place.

Hell, they could of at least explained his British face by saying Marcus gave him plastic surgery or something, I was actually half expecting this.

Whatever, it's really not that big of a deal in the end. It would only really be annoying if Khan did all the same stuff as before, but like I said earlier, he's got a new plot so he doesn't feel been there done that.