It is honestly pretty funny, because Obama's Iran deal was too complicated a topic for the average American to understand or form an independent opinion on, so Trump came in and criticized it, painting it in oversimplified terms, and it worked because Americans are not an intellectual people (to put it mildly) and also didn't care.
Then he does this huge unforced error, sends gas prices skyrocketing, suddenly Americans actually start caring while Trump's messaging is completely unfocused and all over the place, and the old deal, previously a nuanced compromise, suddenly looks fantastic in comparison.
Yeah, Obama sucks, but you gotta appreciate the schadenfreude and karma of watching the right humiliate themselves and collapse their own narrative entirely by their own actions.