Just watched it myself, really enjoyed it also.  Like you say, quite quirky and the humour and style were spot on.  Well directed you could say. 8/10 from me.

It was a really enjoyable film but its hardly Metropolis or 2001 so I think 9 and 8 out of 10 is a bit excessive on my rating scale. Id say its a solid 6/10, it isnt going to revolutionise cinema or anything but its well worth a watch.

I think the problem is these days films/games etc generally get rated on a 5 - 10 scale out of ten, i rarely see anything flop in a review, no matter how bad it is.

I would suggest after watching it, i would also give it an 8, ive seen worse films get the same score.