Comic deaths by themselves? Beyond the emotional reaction that some of them generate, nope.
Actual good stories that get destroyed by extraneous nonsense? Very much so.
You're like the only guy who thought Bucky was going to remain Captain America forever. Brubaker's whole plan was to bring Steve back into the role. Hell, he was planning on doing it sooner according to all accounts. Heroic Age was supposed to be his big return but he was asked if Rogers could be the Top Cop for a while.
If anything, that extended Bucky's time as Cap.
I mean, I think they killed him stupidly and everything but we all knew it was coming. I can't get THAT worked up about it. I've been reading comics too long to get too upset about that stuff.