So why watch it? The same reason you watch porn, not for the terrible over used story, the bad music or the inhumanly amount of non personality of the porn stars (in this case characters of this anime) but for the action even if you've seen this same predictable action a thousand times .
Look if you're desperate for action, watch it.
If you are all about plot and you are looking for a less painful way of self harming ,this is also for you.
But seriously the plot is porno level, actually everything about it is.
I don't know how to do reviews so...