Transformers: Animated

A strong contender for the best TF show of all time. While it may not reach the high points of Beast Wars ("Code of Hero" is still the single greatest episode to come out of the franchise) it was far more consistent in quality, running for three whole seasons without a single bad episode. As a cartoon in general it's also pretty good, with plenty of action, likable characters and strong writing. On the other hand the designs are ugly and the human enemies were mostly uninteresting and dumb.