There's a bit of debate as to which sort of AC2 to use (I'm still team UAC, for the reference) but I think that masks the question of weather the mech succeeds because of its AC2s, or in spite of them. Yes, I'll grant that its one of the better uses of the weapon, but when one wonders what could be done with those 12 tons, its hard not to wonder if this admittedly good mech is as good as it might be.
What could be done? A TC, an extra ER LL, and a pile of heatsinks (I don't know if the crits work) would add meaningful power, increase the accuracy of that power, with minimal loss of range. You could do a larger engine, making the already quick mech even quicker. Improved jump jets. More and better armor. ER LRMs. A bevy of short ranged weapons, just to mix things up.
Now, maybe that's mid 31st century thinking, and in the 32nd century the larger numbers of tanks and other non mech targets makes it more desirable to have those 2-4 extra hits, and I've just missed the ball being out of the loop for a bit. But there's a part of me that thinks that pure damage is usually enough to get the job done, and AC2s just don't carry their weight.