I agree, but then if no one significant dies, then you'll have a bunch of people complain about that too (see: TDKR and The Return of the King).
Return of the King? King Theoden was the big death! And I'm talking about deaths that feel organic. Not just thrown in there for the sake of it. (say, like Harry Potter, killing off Lupin, Tonks, Fred Weasley, these felt tacked on. Dumbledore, Snape, Sirius Black and Dobby were great, organic feeling deaths)
TDK did this fantastic. They killed the love interest. No one saw that coming. But, it also felt organic, and not "ok, we have to kill someone off to raise them stakes"
Other great major character deaths, first off, anything James Cameron does. And he will kill off lots of characters, but, they feel organic, neccessary, and not just for the sake of killing a character just because.
Obi Wan in Star Wars ANH, Qui Gon Gin in TPM, Yoda in ROTJ and order 66 in ROTS.
Quentin Tarantino will kill off character favorites, but again, he does it in a way that feels organic, not tacked on.
Ridley Scott and Spielberg are a couple more directors that seem to kill of characters and keep it real feeling. And guess what, Spielberg took a major character death in the Jurassic Park book, Ian Malcolm, and had him live, which was in my opinion, the right thing to do.
I know this guy gets lots of hate, but Michael Bay with his Transformers flicks, the big death he had for me was Ironhide, but, at least we had a somewhat coherent character development for 2.5 films before he was offed, and it pissed people off, but most of it was OK, because in that scene, it worked!