That's all you have to fire back on? Okay
I personally like Benjen likely a little more than most. I like his character, his character's demeanor and all, and I think that the role is acted well.
There has been a slight off-screen build-up of Benjen since he and Jon initially parted, especially so when he then saved Bran. I've also done some outside-watching research/entertainment and have learned a little more about Benjen.
But beyond that, it's really about his relationship with Jon that led me to be very disappointed in their final moment together. I knew Benjen would eventually have to die, and I wans't expecting it to be all ceremonious or sentimental like between Aragon and Boromir. Benjen is not only Jon's uncle, but he is more a father figure and idol to Jon than was Ned. Both from the same family, both up at the Wall assuming a whole new life and set of duties. When Jon came to the Wall (after Benjen initially invited him), he dreamed of being a Ranger going out with his uncle Benjen. It is well-known that Benjen, as First Ranger, was a hero to Jon. There are allusions to Benjen being aware of Jon's actual lineage. When he disappeared, Jeor Mormont went out himself with the Night's Watch to find him. He's connected in some way to the Three-Eyed Raven. His survival as relayed to Bran is the answer to the cure for becoming turned to the undead, and is a clue as to how the White Walkers are made.
Like I said in my tl;dr, they could have, and should have, had him do something more than show up late, take out a couple surprised nerfed wights, throw Jon on his horse, yell out "THERE'S NO TIME", and then get mowed down by said nerfed zombies.
Just because you didn't see him a lot on screen doesn't mean he wasn't a significant part of the story and other characters' development (in this case, Jon's).