If you can't have fun with this movie, or think it's genuinely bad, I don't know what to tell you, other than you're probably joyless inside and might want to ask your few remaining friends if you're rough a hang because, if they're honest, they'll probably say yes.
I'm kidding.
Kind of.
Is it the worst of the McQuarrie M:I movies? Yes. Do they spend WAY too much time recapping the last movie, regurgitating the stakes, over-explaining the plot, and dialing Ethan's savior complex up to 11, without the winking nature of the last few entires? No doubt. But none of that detracts from the sheer exhilaration of the second half, never mind that the first half isn't even that bad to begin with. Sure, it's a little sloppy, needlessly confusing at times, and overly nostalgic. Overall, though, this movie is a ton of fun, more emotional than it has any right to be, genuinely awe-inspiring on multiple occasions, and features two of the greatest action sequences ever put to film. To the point where our audience broke out into enthusiastic pause the second the end credits came up.
In other words, sure it's flawed, but also absolutely worth the price of admission and I'd watch it again in a heartbeat.