The most annoying thing about mortar pits is that they allow British players to completely dictate their opponent's strategy.
You got LeiGs for OKW and a doctrinal unit for Ostheer.
That's what you get to do: Build one of two units and micro intensively against a unit on autofire. This was already a problem with the 120mm mortar for Soviets and that at least you could sometimes wipe with an artillery shell. But I don't think the team that built Brits paid any attention to or were involved in any way with balancing multiplayer.
It just sucks having your gameplay dictated by your opponent. By the time an Axis player or an Axis team can actually field the proper counters and destroy a mortar pit, the British player has already bought themselves more than enough time and territory control. Mortar pits effectively delete the mid-game for Axis as they mount a proper counter.
And woe unto those that try to preemptively counter emplacements because that actually plays into British hands, since good players don't even emplacements to begin with. An Axis team trying to counter emplacements is a very counter-able force itself.
In the end, win or lose, it's just not, well, fun.
Excelent post, thats another issue. When game forces player to build useless units (isgs would be dead once calliope (teamgames, yeah) arrives) to counter other unit is bs.