I was an old time, 1st Edition Battletech player and had all of it. I let most of my Mechs go a long time ago when I fell out of the game. Looking back I could really kick myself as there were many of the old Robotech and Anime knock off mechs from before the Harmony Gold copywrite fight.
For me the peak had to be MechWarrior 2 Mercenaries. Nothing ever beat it in my opinion. There was a mod for it where you could continue to take contracts after the game officially ended. I loved the mechanics of the game as well as having all the Mechs I rememberred from my early Battletech days like Battlemasters, Marauders and Warhammers.
I would plug myself in with the Microsoft Sidewinder stick in my left hand (before the molded it to rightys) to control movement, keyboard in front of me, and mouse in my right hand to control torso twist and aiming. The hat on the stick fired the jets in all 4 directions with a thumb buttong for up. I was big on using PPCs for long range and medium lasers (ER if you could get them) for everything else. 6 ER lasers, grouped, and fired rapidly in sequence could quickly cripple a mech with a leg shot and generate controllable heat. If it got too high you could slow down the rate of fire.
I also loved the Arrow IV system.