I wouldn't really count Solicitor General as a leadership position. But really nitpicking about whether Obama or Cruz has less experience is pointless, considering how very little they both have, and neither have any executive.
The problem isn't that he's disagreeing with them politically, which he should do. It's plenty possible to disagree politically without making outright personal enemies. The problem is that they, and many other members of both caucuses, hate him personally. Considering as President he'll have to work with them to get any of what you want done, done, that is not a good way to start. Rand Paul, on the other hand has the same positions as Cruz, but by all accounts is liked by members of both caucuses.
Obamacare does need to be repealed. The government shutdown was something that only hindered that cause, and it was pretty obvious beforehand that its all it would do. Yet Cruz decided to go through with something that would only hurt his "cause" anyway. It smells like a publicity stunt at the expense of actually trying to bring down Obamacare.
I don't need your condescension.
Well if some random internet person tells me to trust them, then gosh darn I'd better.