Not so unoriginal as far as these things go, and the pacing and plot development is good in the beginning. It drags on a bit later, but that sort of thing can be alright depending on personal taste. I did like how it kept us guessing about some things, but I found other things frivolous.
Art: Typical manga art. Lots of semi-naked ladies all the time.
I liked Ibusuki, though not so much later on when his character was modified to be 'appealing' and vulnerable. The main character, Tarou, was average, kind of dull but at least slightly different to the cookie-cutter Harem
Main Character (though still had that standard 'unfathomable mysterious allure'). The others were two-dimensional and not really worth mentioning.
Overall: An entertaining enough manga (most so early on), I just personally found it lacking substance other than fluffy love and needless drama.
Also, it bugged me a lot how all of these First Love Zombies were men's fantasies of females. Why did only men have them? What about gay men? And so on. Questions I will never have the answers to.