Gnostic: I can only tell from my experience with past games. where they wave their nerf stick till current strategy and build is not viable and you have to start from scratch again.
In starcraft 2, the awesome and unique Mothership get nerf over and over and finally become the old arbiter.
In titan quest, spirit ternion attack get nerf and have to change the build
Diablo 3 Monk Wizard, Demon Hunter get nerfed that current strategy is not viable anymore,
infuriating players that have to start from scratch.
Dawn of War, necron resurrection got nerfed when once I can resurrect to unit limit 35, the maximum resurrection limit is 24 now. foiling my previous strategy of spam free necron warriors and resurrect and overwhelm.
Because Single Player is also affected by these nerf, all the nerf is quite annoying
hohiro: In Battletech, you have a max of four Battlemechs and the enemy, too. There are no different units which the enemy can`t have. It will be comparable to the board game and turn based.
In PVP you will only play in an area where you don`t go in PVM and every player steer a mech, too.
In Diablo and Starcraft and others, there are lots of possibilities for different setups and it always was that one skill or one race got a bit overpowered and needed to be attuned, happened in D2 alot. So people build Barb vs Barb or Barb s Caster and so on ...
Here you have some piloting and weapon skill and mech which probably gets a battle value and you battle against others with THE SAME possibilities as you. You can just use a mech and weapons as you like, so only thing that could get nerfed are weapons that are overpowered, but the BT rules are quite balanced here.
Well PVP balancing still affect Single Gameplay so your strategies / build suddenly become lackluster. You have the frustration of starting all over again, no matter the balancing is due to overpowered.
After all the goal of games like this is to drive your mecha as powerful as possible, and you would not appreciate your hard work suddenly went down the drain.