This is pretty much my problem with the nature of comics in a nutshell. Thing is, I adore the medium. I love it as a way of telling stories, a fantastic mix of words and imagery. So much can be done with it and so much is, there have been some amazing classics.
But I always encounter two major problems with comics -
A) Most superhero comics, in my opinion, are total rubbish and feel like they are made with no love whatsoever.
B) The continuing format means there can be no real third acts and certainly no real endings.
Don't get me wrong, I really like superheroes. It's not that I think the whole idea is rubbish. I just think most stories just happen to be rubbish. Take Planet Hulk as an example. Anyone read that? It's actually really good. I loved it. But it couldn't have a proper ending because of problem B and then it got all typical superhero nonsense with the next story, World War Hulk, and it all went to hell. Would have been great if Planet Hulk could have existed on its own with a definitive ending. But it couldn't.
They always seem to descend into the same old stuff and it makes the form unsatisfying for me. I could get into one but either a book will never end or it will get rubbish and, eventually cancelled. Very few have the balls to actually finish a story when the book is doing well. Sandman is the only one I can think of.
As others have said, Peter Parker's death will be reversed. This is meaningless, as is just about every other plot point in a superhero comic because they will always be reversed.
The only comic of worth right now that I can think of that doesn't fall into that trap is The Walking Dead which, IMO, is awesome. But even that suffers from problem B. I actually think the series should have finished some time ago.