As much as I like the Transformers and was okay with the concept of a crossover, those issues just got daft. Cobra Commander was spouting ten-dollar words for comic relief, 2 out of 3 lines from any Cobra character/trooper was a joke or at least tongue-in-cheek (I know there was always humor but I'm sure it used to be more balanced), Dr. Mindbender returned as a clone, the plot with Scarlett in Cobra as a double agent was just abandoned when Megatron showed up...

I'd say that was the right-over-the-shark moment, with Firefly & his Zombified Ninjas being the run-up. At least that had consistent art from Wildman & Baskerville; when Megatron arrived they left and we had a different artist every issue for ages, often multiple artists in a single issue! And of course, the ludicrous "starring SNAKE EYES" on the cover...

Toys, it was probably Eco-Warriors. If not, DEFINITELY Armor-Tech.