Yeah, I was playing around with my CPLT-C4 I had in my garage (it was the second mech I bought

) yesterday, seeing if I could do something fun with the new quirks.
So, mounted 4xLRM10s, a medlas and a TAG, lots and lots of ammo and the cooldown module for LRM10.
Tried it a few PUG games.
In some games many had AMS, and the only way for me to get any missile through was to alpha all four LRM10s at the same time (lots of heat). That is, not only can you use terrain, speed, ECM and radar deprivation to counter LRMs, AMS is definitely an efficient means of blocking LRMs, especially Clan LRMs since they can't even alpha. If three or four mechs have AMS, you got yourself an umbrella.
I also realised why I do so well in my STK-5S. It has 2 AMS mounted! So even if I'm slow, my AMS will protect me against most of the enemy LRMs heading my way.
After using my little missile boat a few games again, I feel less sympathy for the LRM complains.
Mount an AMS if your mech isn't fast enough to simply move out of the way. Grind c-bills for the Radar deprivation module if your AMS isn't enough. There are easy counters to LRM systems, not to mention that lights sneaking up on LRM boats get free kills more or less.
Yesterday I had a firestarter sneak up on my C4, and he rather skilfully took of first one ear, then the other, and then I was a heavy with a medlas.
Take out enemy brawlers at range, and enemy range with brawlers.