I have to admit the most important thing for me is the plot. If the plot if great I will want more of the manga.
Though I still read manga with great characters...if they are great then even the shittiest plot will make me wants to read it. After all it got my awesome char in it.
Last...chicks, the cuter, the prettier, the sexier, the better~ If I like the chick I will follow her...even if she dies or isn't choosen by the main char. T.T

Art is in my eyes a attractor since it attracts you to the title but it's not a must in any of the title I read.

the only reason Oh Great gets any work period is because his artwork has tons of fanservice

Fixed that for you.

It's a very hard to explain poll. I am willing to overlook almost anything if the plot is really good. But then again, there is always a need for the reader to be drawn to the character, so if the characters all look repulsive then there is little to no hope.

Just looking at these early results, it seems each person's answer comes down to how they interpret the question...