With the correct weapon groups, she's one hell of a death dealer! However, after a couple brawls, there's a good chance you'll still be walkin', and a better chance that by that point, you'll want at least one more ton of SRM ammo. Twelve and a half SRM volleys goes by in a heartbeat. Very scary and deadly close range fighter. With an option for long range or more ammo, I'd easily give this 5 stars. However with it's speed, 400m max range and limited ammo, I can only give 4... Great in certain situations, but, you may not always find yourself in them.
I'd drop the LT and RT SRM racks for (ER)Large Lasers, and consider losing Artemis on the remaining SRMs as that would let you mount a further 2 DHS. You're still a monster close range, just a tiny bit more sensible. I've tried to make a lot of brawling assaults work in 12v12, and feel that adding some medium range weaponry really boosted my effectiveness, and improved damage numbers.
I would never run SRM6 w/o Artemis. The focus on your damage is much more important than a single DHS. Artemis is the difference of hitting two Assaults at 100m or being able to focus that damage not only to one mech, but one hardpoint in a close brawl.