Resident Evil 4 is insanely overrated in this thread, if you ask me. I thought it was pretty cool, but couldn't finish it. The ammo thing just got way too annoying, the enemies got boring, and the shooting, well, let's just say it was a pretty nimble tank at least, and the suitcase? Hmm. Story and characters, well, not bad for this publisher, let's just say.
The Last of Us imho deserves its 10/10 wholeheartedly, and this is while I hate horror/survival. The quality just oozes off the screen. Not just the graphics are sumblime, but the gameplay is great (and sure, I can live with that AI characters aren't always smart enough to hide, but at least they don't break the game by exposing you all the time), plenty of different ways to go about things, lots of variety, etc. Story not very original (so far for me at least), but the delivery and acting are something else.
Bottom line for me - if this isn't a 10/10, then what game is? There's no accounting for taste - for me, replace all zombie types with animals, and make fights with them a much more natural interaction (sometimes they hunt you, sometimes you hunt them, sometimes they defend their territory, sometimes you help each other, etc.), and this game would be far more perfect than it is now, for me.
I think people just have to realise that a 10/10 is a relative and historical score. In theory, all existing games should have a relative score that decreases as other games improve on them. 10/10 just means that it's the best you could hope for getting from a game at this time.