These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Award Snub: An odd example. When Jamie Foxx was nominated for Best Supporting Actor, a few people protested that he should have been considered the star of the movie, and that Tom Cruise only got top billing because he's better known. Perhaps justified though, as Foxx was nominated for Best Actor for Ray in the same year, this avoided nominating him twice in the same category.
There's also the matter of Cruise not getting nominated at all despite being highly praised for his performance.
Badass Decay: Vincent goes from being a cold-calculating hitman who can perform the improbable aiming feat mentioned below to a simple thug with a gun when he goes after Max, a common cabbie. Since the movie didn't want to have a The Bad Guy Wins ending, they suddenly gave Vincent a course in the Imperial Stormtrooper Marksmanship Academy. Possibly justified since Vincent has been shot in the head right before the climactic chase, causing him to undergo something of a villanous breakdown.
In the final shootout on the MTA train, Vincent's trained, straight shooting ends up hitting the part of the metal door between the two windows, whereas Max's untrained, relatively chaotic shooting ends up penetrating the windows and (eventually) hitting Vincent.
Though this all could be justified since Vincent was still going after Annie even badly injured but with Max there and protecting her, Vincent started to slowly lose it to the point of losing focus, which would be something he would never do.
Honestly, Vincent status as a consumate professional is debatable from the start. Leaving his briefcase unattended in a cab? Shooting his first target next to a window? Reeeeal smooth of you, Vince.
Fridge Logic: A previous case involving a cab driver who apparently "went crazy" shooting several people in a single night, then killed himself, is implied to show Vincent's intentions re Max. But since all the hits are related to the same case, it's unlikely the police would believe these deaths were the result of Max going crazy.