Short Version: Its ok.
Long Version: I rate my tim hortons on their hot chocolate. Not a staple of the tim horton's regular patrons, if a hot chocolate is consistently great, then it means that the location cares enough to focus on everything, not just the staple coffees, ice caps and donuts...
Hence their hot chocolate is ok. Their staff is great and personable but the layout is not the best...lines inside wind awkwardly through out the site.