Due to tme constraints, needing to be cost-effective etc, wouldnt a movie be sadly disappointing- especially as there are so very few movies that have succeeded

Due to tme constraints, needing to be cost-effective etc, wouldnt a movie be sadly disappointing- especially as there are so very few movies that have succeeded depictng real-life characters, books etc. I feel I'd rather read a good synopsis rather than suffer 87 minutes of rewritten boff. I'd also rather prefer a decent biography.