Most overrated 'Mech? Will y'all come at me in my sleep if I say the TimberWolf?
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No, in fact I would agree with you. While an excellent allround Mech with optimal weigh/speed ratio, there are way more evil things you can do with the broken clan tech rules.
MAD-3R Marauder. The heat problems on this thing are incredible. Luckily there's the -3M, which I will take in every instance I'm able to.
In the IS the MAD-3R clearly is one of the overrated models. Terrfiyingly thin side torso armour, ammo bomb, conveniently placed in said side torso and inadequate heat dissipation. It is iconic, though, and few mechs can match its lean, deadly look. But if you really want to bring a good top tier heavy, you should switch to the -3M. It brings everything the stock
Marauder does and it can use it. It has just the right amount of overheat potential to get the most out of its armament, in my opinion.
There was a time when Marik Mechs and Marik heavies especially, played in the top leagues. (no pun intended) See also the ON1-VA. The Succession Wars were a good time. Might be that we will see such times coming back, now, in 3145.