I'll just chuck my impressions here, then.
I got it for $30. Haven't finished it yet (I'm about halfway through), but so far I have to say it's "alright." Not great, and certainly not as fun as the original, but I don't completely regret spending the $30. A few more details:
It's still mindless fun mowing down the zombies, and there are usually enough around to make the slaughter fun (for the record, I'm just under 5,000 kills). They also seem to get more aggressive as the game goes on: they were statutes in the beginning, but more and more of them started becoming "Active" as time went on. It's still not 100%, but perhaps that will change as I get further?
The graphics suck, but I've never been one to mind those. I enjoy the new mission format, although I do wish there were more opportunities to just dick around without having any pressure to try and S-rank.
I was disappointed that they removed some of the psychopaths, as those were my favorite part of the original. They tried to add in zombie versions of the removed bosses, to add some variety, but it's a poor substitute, I'm afraid.
I'm also confused about the sudden presence of red rope in many parts, which prevent you from going through certain routes. Mind you, they don't actually cut off access to any parts of the mall, they just channel you down certain lanes.
The guns are more accesible and fun to use in this game, and you never really run low on ammo. However, they don't really make up for the inability to store multiple melee weapons, which to me was a large part of the original's charm. What's worse is that there's no way to tell how worn out your current melee weapon has become: it could be 100 hits away from disintegrating, or just 1.
The difficulty has dropped, but I think that's a good thing, as the original forced you to spend the first playthrough or two just levelling up, if you wanted to have any chance at getting the complete ending.
The books you can hold on to are near useless so far: they teach new techniques, but most of them are worthless. I'm hoping this will change soon. But then, the abilities in the original that you gained for levelling up were also pretty worthless, so that's par.
Overall, much of what changed is for the worse, but not THAT much for the worse. You'rre better off sticking to the original, if you have it, but if you haven't, or if you're willing to make allowances, this game can be enjoyable enough. The curious should at least rent it.
Oh, and I hate those f***in poodles.