I don't think he'll be as bad as boehner, but that's not saying much.
This.
He got early Tea Party and Conservative cred with his alternative budgets and Obamacare replacements that involved cross-state insurance licensing, and getting all the price competition into healthcare as was possible. However, he succumbed to realpolitik too often, and instead of putting his foot down and refusing to vote for things, even if it meant a Pyrrhic Victory, he supported unpopular things, with the rationale "It would pass anyway" and "we got XYZ in trade" or whatever.
In actual practice, he's a conservative leaning, but establishment "this is how things get done" kind of guy. And too much of America, well, at least the half of it that's Conservative/Libertarian/informed/supply-side in economic outlook is far too fed up with things already to stomach any "compromise".