It sounds to me like you're paying attention to only the hyped games, this is why so many people are disappointed when hyped games don't deliver.

Though they say gta4 delivered, and you can expect mgs4 to deliver at least for single-player, the online may have trouble…

but there's other games out there

As for Haze what struck me about it right off the bat was the ground textures, particularly the one that is a leaf-pattern, was so blatantly 2-D-looking a child could have designed it. They said they worked hard on it, I guess by that they didn't mean the graphics though.
There was some good stuff, such as good animations, especially when your shot hits an enemy and it takes a while before they fall over and you can tell that you hit them… but it's one of those slow shooters, like a lot of them are, and I think it's stupid that these supersoldiers can't move more than 4 miles an hour. Also that nectar makes it a bit too easy, and so does the objective pointer at the top, which discouraged me from going around and exploring in all that interesting vegetation.
The nectar thing is not a new idea either, Resistance fall of man has effectively the same thing with the Chimeran's rage mode. And it apparently uses an older, established 3d engine instead of being built on a custom-built new one.

If you are really into online, get Warhawk, it is still the best for online, though the only major 3rd-party ladder has had some problems with teams cheating. It's got all the best modes, and zones mode is an advance over the usual capture-all-the-bases thing, where the longer you occupy a base, the more territory you control around it, along with extra weapons and vehicles.

Best demo I've seen in a long time is the Bourne Conspiracy, it looks like sp only but it dares to do something new, and does it well. It gets your adrenaline going to, the short parts where you have to run, run, run and reach the next checkpoint, and the intermittent fights are surprisingly realistic and the controls intuitive and easy to master.