Conversely, some of the original designs are specialty designs that perform poorly outside their roles (Jagermech I'm looking at you). Those machines will consistently underperform relative to their BV when used in roles for which they weren't designed. To some extent, the Hunchback, Panther, and Cyclops fall into this category. Don't get me wrong, the AC20 is a beast, but with only 160 armor to close with and being the big scares they are, they tend to attract undue attention and therefore fall before they can really bring their firepower to bear. That said, I'm always shocked by how long those twenty rounds last...
I'm going to disagree with you here.
I mean, I agree that BV isn't perfect but one of the things about it is it is a HECK of a lot more effective than say tonnage.
For instance, if you look at the Cyclops & the Hunchback, both give you an AC20 but the Cyc gives you LRMs and a much bigger chassis for physicals as well and at a small BV increase.
Compare that BV to the Atlas which also packs similar weaponry but a bunch more Armor and you'll see what I mean.
The Jaggermech is NOT a great mech, but it certainly isn't expensive in BV, and its most often ignored, all the while laying down small 2-5 point hits that begin to add up over the long term.
Sure, an LRM15 is more effective than an AC5, but under BV the LRM15 also COSTS more than the AC5, so it balances out.
Where BV fails IMHO is in overheating units....its very rare that you can alpha often enough make a difference but an overheating mech pays for all those extra guns.
The key with most units is to know WHEN and when NOT to field them.
I mean a Hunchback fighting on a pancake for terrain will get that extra agro you mentioned and die fast, but that same mech when paired up with an Archer & a little cover will likely last a lot longer.
An Awesome is not the best unit to bring to a city fight where the slow speed, minimum range, and direct fire weaponry are at a disadvantage. Not that a 16 point kick is a bad thing but its not a triple ppc barrage either.