I honestly like everything about it. Once you drive one, it's hard to go home without it--it's a sick obsession!
There isn't anything that I can point to and say "this needs improvement," (so far) Toyota seems to have done pretty well with the FJ.
Even the rear visibility is fine for me--I'm 6' and can clearly see out the back and use the mirrors properly, so I'd imagine that being 6'5" you'll have no problem either.
My wife on the other hand is only 5' 5" and she is intimidated by the FJ in reverse (although, she has a hard time in reverse to begin with--our Jeep Cherokee has had the rear window / door replaced a time or two).
