Hi Eroc,

I don’t see any value throwing review content by blocking in robots.txt, (no offence to IKEA ). I recommend to configure product pages as it won’t generate pagination issue for having too many reviews.

It can handled by loading all comments on same product page (till load time won’t hurt) and display to user in chunks (without changing the url). If your page support 50 reviews (without hurting load time) remove the “Add Review” button after 50 review’s so you won’t receive new review’s or add moderation  to simply chose which 50 comments you want to show because every review will not have same impact (and good enough to publish :P).