I collected Toybiz ML and still am. They are really good and Toybiz did a fantastic job with them (although it took them a few sets to get the women bodies right).
Hasbro's ML was pretty shoddy quality though supposedly they improved near the end... from what I've heard.
I haven't bought any MU stuff cos its pretty expensive and I am collecting other stuff but from what I've heard, they are good so if you want a scaled down version of ML, I reckon, go for it.