None of what you pointed out refutes that those features are imbalanced or broken. On master difficulty companions and summons still fight enemies as if it were normal mode, thus they make almost any encounter trivial. You usually don't even have to do anything, just sit back and watch. And don't even mention the bugged giants.
Comparing a poorly balanced game with a game with even worse balance as a justification is a typical logical fallacy.
It's a broken sandbox and that's the way gamers like it, apparently. Combat/gameplay mods will do a better job eventually when they're released.. but it's too much of a sandbox to be salvageable. What's left is wandering around identical looking caves, towns, and houses while fulfilling mostly fetch quests, then.