Of course in real life an injuy like would've put Coulson into early retirement, so there's going to have to be a good explaination as do how he survived.
Dude works on a floating aircraft carrier
. "Real life" ain't exactly a factor here.
There are a lot of supposedly realistic shows and movies wherein the lead characters suffer serious injuries, often multiple times, and are able to recover fully and stay on the job with no loss of performance. So yeah, it'd be fanciful compared to real life, but within the range of accepted breaks from reality in fiction.