I know that your post is quite old, but if you are still looking for a script to show comments on your site, this might work:
One thing that I find quite interesting about it is that, in reality, they allow me to use their reviews, which makes things easier for me, since I do not need to collect them myself.
I have not seen anyone else using this script, so it seems that they are quite new.
Anyway, try it if you want and if I find other scripts, I'll make sure to post them here for you.
I hope this helps