I loved Battletech when I was younger.
But while creating the mech diagrams was fun, it was pretty tedious to have to account for damage, ammo, heat, etc.
Plus I wasn't too crazy about the little paper mechs, but didn't have enough cash flow or skill to try painting my own.
When I saw the Dark Age boosters, I loved them!
The detail was great, and I loved that everything was pretty much self-contained.
No sheets to keep track of, really not even any maps.
Any surface was playable and you just needed the figures, dice, flexible ruler and something to mark actions with.
It was pretty intuitive (well, having played BT anyway) and gameplay was fast and smooth.
One of the things that appealed to me about the original set was the storyline explaining why there was a "mech shortage".
I thought that the construction mechs were great ideas, and was actually a little disappointed when they were pretty well made obsolete in the later editions.
But definitely the heat dial and the click-damage counter were top on my impressed with list.