Lee Curtis’s review published on Letterboxd:
I've always considered Forgetting Sarah Marshall to be an underappreciated gem. It has a watchable quality that few other comedies like it achieve, but owes most of its appeal to Jason Segel.
So often restricted to the same role as a gentle giant, Segel is yet to put a foot wrong in his film career because he maintains the everyman charm that allows him to create consistently relatable and instantly likeable heroes. It's this authenticity that also allows his natural talents for comedy to shine through for each of his characters. Once again he balances his quick-witted intelligence with childish playfulness and thrives with the improvisational comedy that Nicholas Stoller employs as the basis for the jokes in his rom-com. By using this brand of comedy the natural off-screen chemistry between the actors imbues every scene and it's clear that the cast had as much fun making it as we do watching it.
Forgetting Sarah Marshall is one of them “always on” films with a unique ability to hold your attention regardless of how many times you've seen it before and regardless of how much you've missed prior to switching to it you find yourself watching until the next ad break, often longer.