Okay, just beat it. The last few hours of the game are just frustrating, waves of undead coming at you, obviously designed for co-op play. The ending is kind of a big shrug, as I didn't give a crap about any of the characters -
spoiler (click to show/hide)
when Jin died all I could think was "Fuck, there goes all my stuff."

Hopefully they'll fix a lot of the more miserable aspects of the game in the sequel (scale it down a bit for single player, tie the story together better so there are fewer wtf leaps in logic, tone down the repetitious boss encounters, etc). Also, did we really need to see the animation and hear the character eat
every single time you pick up an energy drink/fruit/snack? Those things give such a tiny health boost that you have to consume 3-5 of them to make a difference, and watching the "grab/gulp/smack" animation gets really, really old. I like it when devs know you are fully educated as to what eating and drinking look like and just give you the health when you click on it. Who gives a shit if it's "realistic?"
Over all, I enjoyed it, although there were times (especially midway through the city section and towards the very end) that I had to force myself to continue. I never ran into the save bug, but I experienced several other bugs throughout the game.