Nowadays in ML, with newer monsters having better and better skills, power, traits etc.., the older monsters have little place in the metagame by any stretch of the imagination.
But that is because we are comparing all monsters of the same element with each other.
In Dark Wars, if you had Ixofex, Carlo Canbino, and Jasastur, whereas I was using Dr Hazard, Lostyghost, and Sir Slumberly, would it be a fair fight? I think not.
But what if monsters of the same element were grouped in batches of 10, and labelled Dark Gen 1, Dark Gen 2, Dark Gen 3, etc.. and then we could have more equal fights?
This would also give us a reason to abolish gold slavery and attach real runes to our 'older' monsters as we know they need to be used to battle at some point.