I see a lot of ECM discussion, raised some myself.
I joined just after ECM was introduced, but I also watched
a lot of Youtubes on LRMs before ECM.
Lets start with LRMs.
Before, they were at 2 points damage.
They were set and forget. That's right, Lock, shoot
and immediately go do something else and those
missiles would run around chasing you.
That was Over Powered.
Now: You HAVE to MAINTAIN lock, either directly or
with a team mate, for those missiles to hit. What this means is that either you
or your team mate has visual contact with the opposing mech, so, is
of course open to retaliation. Team mate moves away, lock is lost, missiles
hit the ground...
Also each missile lost damage to 1.8. (1.7 cited also a few times)
Artemis makes it so that 100% of your missiles hit the target.
But you need VISUAL line of sight for it to work.
Even with ECM gone, LRM dominance has changed very much.
Now lets take a look at ECM.
It was brought forth to counter LRM multi directional attacks.
This was, IMHO, a mistake from the start as all you needed is tone down
LRMs like they did. I own an LRM boat and I agree with the extensive
nerfing it went through...
If the ECM followed BT rules, I would be totally OK with it. But ti does not.
BAP is supposed to counter ECM, but it doesn't. ECM will cancel any lock.
Remember that lock is there to help your team mates as well. It's part of
the game and it's not about the "oh you cant use real weapons" whining.
ECM also totally disables missiles, even SRM, inside the bubble, but outside
as well. Anyone who fired SRM without lock know very well they spread out like
shells on a crooked shotgun... So only maybe 20% hit.
ECM also prevents tracking team mates under the bubble, even with BAP.
This is just insane. Only TAG outside the bubble can get a lock Which is OK
in itself, but I should not have to tag every opponent inside that bubble...
So why is ECM soooo OP that, in polls on this forum, 81% of people
want it nerfed or removed?
Because the original issue that brought ECM HAS been fixed. LRM boating needs
much more talent and situational awareness that it did before. However, ECM stays
the same to fight a non-existant foe.
PGI, Gart, devs, my suggestion is to START with BT rules and tweak from there.
We are Mech Warrior players, in my case from Monde Virtuel, more that 15 years ago,
and I came back from gaming retirement specifically to play Mech Warrior.
As most other people here. So why not cater to your target crowd?
Is things go well and everyone has fun, we will spread the word much
better than any press release and WAAAYYYY better than negative reviews
from places that understand MWO's imbalances.
Start with Battle Tech and tweak from there. No one here will complain because
THIS IS why we are here...

Good luck.