This movie was beautifully produced, with great attention to detail and a fantastic ensemble cast. I was really impressed by how well everyone could sing, though Fergie's number was clearly a standout.
The story itself, however, is a bit odd; it's not nearly as linear as, say, Chicago (which Rob Marshall also directed). It's essentially about a director (Day-Lewis) who's looking for inspiration.
All in all, I'd say any one who was a fan of a great show will probably like this--it does take after Chicago in production values. If you're looking for an easy to follow or obvious plot, though, this one will probably be a bit puzzling.