He did a fine job with what they gave him, I saw him coming back into the role easily.
if Blackbolt never appeared in a previous iteration, it would be unfair to judge Anson Mount off of his short cameo.
I wasn't basing my statement on his preference in the role ( I got nothing against him as an actor/ or a person for that matter) I was just being realistic about it...
I saw this being in the same light as the Damon as Loki gag in the Thor movies
the role probably should have been filled by one of the previous actors (Ioan/ Miles/...) as it was just suppose to be a reference (like all the other characters we saw) or pulled some Shazam style "headless Superman" joke, where we only see him from behind and never actually see his face lol... but they decided to go "Meta" with it using a "Fan-cast" reference, instead
if anything they had him play it up too seriously... and should have just let him go all ham on the role
it's true, I was never really in the, Krasinski camp, an a lot of those fans did him more of a disservice then anything else with their overly aggressive "KRASINSKI OR BUST" mentality... which kinda alienated some people against the idea...
but, I was never fully against him in the role (if it happened, it happened) I would have been okay with it... but when it started to become clear that it wasn't happening and the fans persisted, it just got tiring after awhile
bottom line that was a different movie with a different creative team/director/... it makes sense that a new team would want to give their own spin on the character (casting someone who fits they vision of the character, not have to write the character with a set actor already in the role)