I love all my Energon figs. I despise those frakkin' Energon chips/stars and the stupid Autobot Powerlinking and most of the Decepticon "Super Modes".
AND THAT DAMNED YODELING, SKIING FREAK!!!
I also loathe Cyber Keys, and I'm not a big fan of 99% of the Minicons. @hmmm@
Can't say I recall hating on any particular toys, then finding I actually like them after I've seen them/played with them.
I hated all the Energon basics but Arcee, and still do.
I hated Energon Prime, and still do, though I have both the deluxe and big one. I love my Energon Bendy Prime since I modded him (bye-bye Super-##$%$#-Mode Helmet and fugly legs!), and I will love my big E-Prime once similar modding is finished on it (legs replaced, helmet gone, slimmed own to heroic, rather than hero-sandwich, proportions).
I hate Energon Galvatron AND that fugly purple G1 re-issue.
I guess the only ones that come close to the topic would be Beast Wars, which I never hated; more that I just had a "wtf?" reaction. I didn't get my first BW toy till well after RiD had come and gone.