With only 3 mechs to choose from Uller A, Uller B, and Cougar A, the Clan mech strategy is a battle line 3 layers deep. First you have the Uller Bs who can tango with the IS Owens Bs, Raven Primes, Osiris Bs, etc. Then you have the Uller As backing them up with Gauss Rifles and ERMBLs to snipe. If the enemy wants to get to the As they need to get past the Bs first. Backing all of that up you have Cougar As who will bomb on anything that presents an easy target or keep the enemy engaging MASC and burning out their heat sinks and coolant to keep from getting bombarded by LRMs.
While the Uller As Gauss Rifle is easy to blow off, it also only takes 2 or 3 Uller As to connect with Gauss Rifles and ERMBLs in the opening exchange to eliminate an enemy light mech. I think 4 will take out a Hollander through the side torso. Meanwhile it takes a couple salvos of SRMs for an Owens to do the same to an Uller. The Osiris A with its ERLBLs takes 2 alphas to take off a Uller's Gauss Rifle, but the paper thin armor on the Osiris means that if it receives return fire it's not in much better shape.
Again, it's something I'd love to see. I think the tactics would change drastically given what assets are available. Not to say the Clans can pull it off with all the C3, Narc, TAG, ELRMs, SRMs, and RAC/UACs in their face early on.