'Just My Luck' runs a little thin, but it narrowly did enough for me to enjoy it.
Lindsay Lohan and Chris Pine don't, in my opinion, share as much onscreen chemistry as is generally needed for a romcom, though they are both likeable and produce solid enough performances that I was happy to watch them act throughout. It's amusing seeing McFly - a very good band, back then at least - billed as "Introducing..." given UK audiences would've 100% known who they were at the time of release.
The movie does get a bit repetitive as the plot is, as noted, extremely simple, but again there's just about enough in there that I had a positive time watching.