Even saying MGS4 has the better SP is pretty stupid. They're completely different games. Both can be played like an FPS, but one encourages more stealth and finesse. If you want constant non-stop shooting, KZ2 might suit you better. In terms of gameplay, they're both great quality games.
Seriously though, I get tired of MGS4's act-installs, cutscenes, and loads. The chase near the end of the South America act has a ridiculous amount of loading parts. Besides that, sometimes having to skip 3-4 cutscenes makes it feel like a loading time itself. I also almost forgot that even pulling up the weapons/items menu pauses the game - it'd be cool if they reduced the size of those menus and made it so they didn't pause everything.....it'd also make the game a little more challenging in a nice way.
For me, the gameplay gets interrupted far too much
