It's a game with 1 mode of play, BattleMech combat. That shoehorns you into having to create more BattleMech combat in order to do stuff. That means coughing up more 'mechs and vehicles to fight, at a minimum.
Compare that to a Battletech novel or maybe even an RPG game, where maybe the characters also do stuff outside the cockpit, you have a broader array of options for scenes, storytelling and play. You can run around on foot, investigate, have conversations with different characters, get into shoot-outs and fist fights. Get into car chases, float around in a space suit.
And I'm not talking about the cutscenes, I mean actual gameplay.
When the gameplay is 100% about BattleMech combat, your solution to every play situation is more BattleMech combat.
It is, what it is. But that's the WHY behind the game revolving around you having to wreck a truly tremendous number of opposing BattleMechs and vehicles.
In this game BattleMech combat is the cowbell. The solution to everything is more cowbell. (If you know you know, if you don't know the reference, ignore this, old joke)
Now an argument that there could have been more variety of BattleMech combat. Situations that required night vision, underwater, in space, (and probably some other BattleMech combat situations I haven't thought of) that as a critique of the game I can understand.