Despite a super conventional plot and an ending that goes on at least one episode too long, this is a great show. Like many of my favorite series, Toradora successfully transitions from comedy to drama; after a few episodes I was hooked and the trap only tightened as the series began to lose the jokes for good old fashioned love polygon angst.
You'd have to be braindead to see the first episode and not know exactly how the series will end, but most people will be surprised at the surprisingly well developed cast that accompanies the predictable plot. The characters manage to be more than paper-thin copy-pastes, and this is what sets the anime apart from similar conventional fare like K-On. Every member of the love-polygon is genuinely likable and goes deeper than their initial character archetypes would suggest. Sometimes a genki girl is just a genki girl. Not so in Toradora.
Throw in reasonable visuals (great character designs, ok motion) and a two awesome sets of OP/EDs, and Toradora is a new favorite.