I always hated the gimmick stuff when I was a kid. I wanted my toys to be the same scale and posable. I wanted tons of vehicles of different sizes. I wanted playsets.
In all honesty, 3 3/4 was even a bit big for me. I would have been fine with 2" figures so that the vehicles could have had way more accuracy and options.
You mean like M.A.S.K.?
--Jonah