Mamma Mia I would rate a 8/10 but I only enjoyed it that much because of the cast. Musicals aren't normally my thing, and my mom didn't tell me that's what we were going to watch. Watching Pierce Brosnan sing Abba songs with Meryl Streep was funny, though. Pretty much a chick flick, and I think ladies ages 40+ (maybe 35+) would probably enjoy it more.
*note, sit through the credits to watch them sing more Abba songs.
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