Regarding Jeffrey Wright as Leiter, he definitely does not remind me of Norman Burton's version of the character. I actually think he's closer to the original, Jack Lord. The trouble is he's had a criminally low amount of time on screen to establish himself as Leiter. But he's no "dogsbody" sidekick of Bond. Remember the line when 007 has been cleaned out by Le Chiffre and can't buy back in to the game?
Leiter offers the buy in on condition that the CIA gets Le Chiffre. Bond asks about the money - "Do we look as if we need the money?" replies Felix, almost arrogantly.
"Dogsbody"? I don't think so. At that point it's Bond who is the supplicant.
I think, sadly, the way Beam treats him in QOS results in the very image of a doormat, not unlike Jack Lord (and I think Lord came across as a stooopid American foil for Connery's cool English gentleman than Fleming's American-equal-of-Bond: he FOLLOWS Bond from the airport(!), he's been trying to unravel Strangway's death and topling without success, seemingly oblivious to Dr No as a person, JB tells him to
off, I'm off to Crab Key on my own...: Leiter shouldn't have been in DN. Lord looks good, though)
I DO agree Wright has been poorly used, particularly in QOS. Though, again, having Leiter at the card table in CR and his frustrating losing made hime, well, look a looser, compared to the dick-duelling of the uber-cool Bond and Le Chiffre. His offering Bond cash simply made him look like an American international bureaucrat who knows the way of the USA will be obeyed as soon as money is offered. Yes, it is arrogant, but not in the Fleming-cool Leiter way, unfortunately.