These kits are suppose to change the way you play the commander with distinct trade-offs that favor specific builds and strategies. It is normal for them to be superior in those specific situations or else why play them, but a lot of the more well received prestige kits are straight up buffs to the commander.
For example all of Raynor’s kits are superior to vanilla raynor. Kit 1 is significantly stronger since pure bio was already a viable strategy, and Kit 1 buffs that to high heavens. Kit 2 is Raynor+ where your bio is no worse but your mech is much better. Kit 3 is slightly more situational but BC’s are almost never bad in any situation and having hyperion on the field with more than 50% uptime is just insanely strong late game. There is no reason to play vanilla Raynor ever again with the current balance. Likewise, all of Dehaka’s kits are superior to vanilla Dehaka, and he was already one of the most noob-friendly keyboard face-roll commander. I’ve started soloing brutal with Raynor/Dehaka, and I’m not even a remarkable player. If I were to play ladder, I would probably be in gold to low platinum (50%-60% percentile).
The big problem with this power creep is that Brutal+ is a broken and inconsistent experience that is incredibly RNG heavy. I go into detail here:
If these kits make brutal a joke and brutal+ is not consistently enjoyable, then all you are left with is soloing brutal, weekly mutations, and custom games that require a party. I’ve largely stopped playing as a result because so much is starting to feel like a waste of time or a grind.