1. Treatment of lower castes as virtual slaves
Not true of a good chunk of the clans already. Ghost Bears, Goliath Scorpions, Cloud Cobra, Diamond Sharks/Sea Foxes, and Blood Spirits off the top of head all had much more fair treatment of lower castes (sort of, Blood Spirits kinda treated everyone equally assholishly?).
2. Pure belief that might makes right
Again... not really true of a lot of the Clans? Sure, their Trial system is functionally set up around that... but then, the Trial system is supposed to be a replacement for larger scale war where might does make right. However, many of the Clans had other core beliefs that drove them. Ghost Bears valued "family". Goliath Scorpions valued the past and history. Cloud Cobras were straight up warrior-monks and deeply religious. Diamond Sharks/Sea Foxes followed the almighty dollar. It was mostly the strict Crusader Clans whom had little to define them outside of being a Clan whom really embraced that ideal.
3. Assumption that the Inner Sphere, and it's people, are less than they are
That was only an assumption of the Crusader Clans.
Warden clans pretty much didn't think that. Sure they felt their society was BETTER than Inner Sphere society but, well, to be frank, that's the NORM for BattleTech. FedSuns feel they are superior to Dracs, Dracs feel they are superior to Lyrans, etc. So I really don't see the idea "we think our society and culture are superior to yours" to be a "bad guy" trait in BattleTech...
4. Hypocrisy of despising waste, but happily waste lives in the training of warriors as well as the waste of 'old' warriors
We do not see the training methods of any Clan but the Jade Falcons, and other clans handled older warriors differently, not all the Clans just shoved them in infantry units to die, as such, we can ALSO assume that save for the live fire trials, other Clans handled training differently. As to older warriors, some put them into retirement. In the Diamond Sharks almost ALL warriors retired to the Merchant Caste at some point, hell, some even did so young if they felt they weren't going to earn a bloodname, and weren't really thought lesser for it.
Honestly, that list of "problems" with the Clans seems to be mostly about one specific Clan... the Jade Falcons...