Firstly, I would argue that it is important to assess the quality of a torrent site by its Alexa rank.

Obviously, the lower the Alexa rank, more people visit the site but I would say that this metric can be misleading as it does not take into account user-experience and another facts like:

how many ads you need to get through just to torrent?
how does the site interact with the user?
are the torrents there safe or verified?

etc …

Secondly, there are now many interesting torrent sites that might not be so “popular” yet compared to the big guns like TPB, KAT or 1337x but they provide a really nice and smooth interface with some cool features that you would not usually expect in a torrent site, these are:

P2P Guru
- no ads
- no registration required
- clean user experience with many user features and quality index of every torrent
- complete information and ratings for every movie
- users can add missing torrents and links for a reward back