As I've said before, every game has its audience, and ultimately reviews are just guidelines. The collective reviewer opinion may be that this is the game of the generation, but long time fans especially I can see going either way with this title. It makes a ton of changes from the standard MGS formula that I know a lot of people won't appreciate, just as many people will.
Personally, I've only played about 30 minutes of an MGS game, and that was Peace Walker. Maybe MGSV would be fun, but I have no reason to pick it up.
A shame that you can't enjoy the experience, but at least you gave it a shot. If you bought it physically, I suggest tossing it on eBay before the price goes down. You should still be able to get almost all of your money back.