I'll admit to having never really been into GI Joe, but I do appreciate the Joe crossovers from afar. If they had been released in standard Legacy scale, I would have bought them all without hesitation. As is, they're too big for me, and too expensive for being a scale I don't want. Cheaper and big, I probably would have bought at least a Megatron and Soundwave as they look amazing.
That said, I totally understand why they were made the way they were. Interaction with standard sized GI Joes was a huge selling point for those who DO collect Joes, so I don't fault them for that decision at all. It just made them not for me.