Went to see this last night on a whim. I didn't really know anything about it other than it being spearheaded by Markiplier. I am familiar with him but I've never really followed his YouTube stuff.
That being said I think this film was a pretty decent effort. However, it was too long (my wife fell asleep about three quarters in) given the subject material and felt like it was lacking something. Markipliers's performance was surprisingly good. Overall 6.5/10 for me.
Edit: I read this review after I wrote this comment and I think it's worth a read if you're looking for a more in depth analysis.
https://www.indiewire.com/criticism/movies/iron-lung-review-markiplier-1235176184/
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