Mostly because I wanted to stick it in people's faces.
Here are the results of my very first ride in it!

- Names blurred to protect the innocent
This result was typical, scarily so. I seemed to hit around 800 damage a match just about every win. Games where my team got stomped I still did around 400-600. This was me PuGing it up with randoms. I would hate to see what I could do in a 4 man.
Aiming SRMs is not hard. Protecting your cockpit is not hard. Sneaking up on people is not hard. The short range isn't much of a problem, maps are tiny and crowded. The arm boxes will get shot occasionally, usually by the time I'd lose one I'd have already killed or crippled multiple mechs on their side - not that bad a trade.
I'm sorry people don't want to hear their favourite ride is OP. I know you would probably like to attribute your high damage and kills to your skill and ability. Sorry, but that just isn't the case. What we have here is a mech that provides a surplus of success for a minimum of effort.
The A1 is a problematic mech. It can only mount missiles and with the state of ECM, streaks and LRMs are unreliable. But 6 SRM packs on a chassis that can move and brawl like the Cat is way too much power in one package (my strategy for killing Atlai has been to walk up to them and press M1 a few times).
Thankfully, there is an easy way to bring the A1 down to a balanced level without completely overhauling the mech or SRMs. Lower the max engine size to 260, limit torso twist to 900-100 degrees. Boom, done. It can't flank/pursue nearly as bad, it can't lol-track mechs in a brawl. IE, it actually has weaknesses.