The November 4 patch brought probably one of the bigger updates to MechWarrior Online... Mech Quirks for Inner Sphere mechs. Although a handful of Inner Sphere mechs were given quirks (some positive, some negative) a while back, the list was fairly short or the quirks were not very effective.
The MWO community was not impressed and generally ignored quirks unless they effected one of their favorite mechs in a negative way (e.g. negative torso twisting and chassis turning on Victors). Not a big deal until the Clans arrived back in June. Clan mechs have been dominating the battlefield since then and most Inner Sphere mechs have been viewed as being sub-par or lacking. Piranha Games took these views to heart and stepped up their introduction of quirks to all of the existing Inner Sphere mechs.
The results so far have been impressive. Not everyone is happy with which mechs got which quirks, but overall, I feel they have made a positive difference in the game play by bringing some Inner Sphere mechs up to a similar damage potential as the Clan mechs. In the past week, I have noticed more variation in the Inner Sphere mechs being played and not quite so many Clan mechs on the battlefield.
Of course, it is still early and Clan mechs will be getting their quirks adjusted soon. But, if you haven't played MechWarrior Online recently, I suggest you do and take one of your old Inner Sphere mechs out for a spin. There are some nice changes and you might be surprised.
Be sure to check out this site that, as far as I can tell, has all of the quirks for all of the Inner Sphere mechs, It's very useful and easy to use.