These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Meryl Streep actually won an award for her rendition of "Mamma Mia".
She also did "The Winner Takes It All" in one take.
Ending Fatigue: There are three musical numbers after the plot is wrapped up, plus the first portion of the end credits has two more songs. Amusingly, this opened in the U.S. the same day as The Dark Knight, which also had trouble wrapping up.
The stage version ends this way as well, but "Take a Chance On Me" occurs before the wedding, and "When All is Said and Done" doesn't occur at all.
Family-Unfriendly Aesop: Sleep with three guys and not know your baby's father? No, don't take a paternity test, wait a few years and have fun singing about it.
Germans Love David Hasselhoff: Due to premiering on the same day as The Dark Knight it wasn't as big a success as it should have been. However, it did extremely well in Europe (where superhero movies aren't that popular), and at the time of its release was the highest grossing movie ever in the United Kingdom. It currently sits at sixth.
Actually, releasing it on the same day as The Dark Knight (as counterprogramming) was an intentional choice, and may have even helped its success. It made $144 million in the US, which is huge for a musical chick flick. Moulin Rouge, for example, was considered a success at $57 million. Of course, its ridiculous foreign gross still means that its an example of this trope.
Not to mention it actually did outgross Avatar in ABBA's native country, Sweden.
Narm Charm: The ladies in full getup after the movie's fully over? Alright, you can take that with a giggle or two. But when the GUYS come out in costume for "Waterloo"? Oh dear God.
She Really Can Sing: Amanda Seyfried surprised a lot of people. In fact, one of the reasons she was cast was because she could pull off a high note during "I Have a Dream" ("I believe in angels..."). Her performance here would later be heavily credited for earning her the role of Cosette in the film adaptation of Les Misérables four years later.
Romance on the Set: Amanda Seyfriend and Dominic Cooper dated for two years, but broke up due to him staying in the UK while she stayed in the United States.
Also, one critic commented once on how she keeps touching her face and using her expressions mostly for acting, which makes it seem as if she’s just a head. One journalist in Israel asked her if she was trying to prove she has a body as well, and Streep replied this might have been the case.
Better example would be Pierce Brosnan. Clearly he was cast to be swooned over rather than listened to.