I thought a thread like this might be in order.

Mine would have to be the Energon Line. The thing to me doesn't work that well as a quality TF line, but instead feels like Super Robot Wars but in a really good way.

Unicron looks like he's been assimilated by the Borg, the deluxe Autobots look like they're out of the Brave series, Prime/Wingsaber and Omega Supreme look like they're a Megazord Team and the rest remind me of a heap of different Super Robots with similar attacks.

And yet at the same time, the toyline works as those things. The Prime team is one of the few things form Energon I kept while I love Energon Unicron's colour scheme because it's so unconventional while working at the same time.