An amine fan site Anikore reports some anime rankings. I would like to introduce its bookmarks' ranking. Anikore sorted TV anime shows by the number of visitors' bookmarks. The No. 1 TV anime of 2015 winter season (2015 Jan- Mar) was 冴えない彼女の育てかた (Saekano: How to Raise a Boring Girlfriend). "Saekano: How to Raise a Boring Girlfriend" got most visitors' attention.
The below is the top 10 list. All images are linked to Amazon.
World Break: Aria of Curse for a Holy Swordsman
The Testament of Sister New Devil
Saekano: How to Raise a Boring Girlfriend
Source is Anikore.