Delivering on quick 90 minute thrills with panache while also having a genuinely meaningful message, Source Code is an intriguing little sci-fi movie with an extremely watchable Jake Gyllenhaal in the lead. An energetic score flows around the film's most intense moments and the cinematography is carried out with style. While I wasn't particularly emotionally invested into the story until the 3rd act and a small amount of story beats weren't as impactful as I felt they should be, I was almost always immersed by the high-concept and Gyllenhaal's very grounded performance.
3.5 stars == Decent/Good.
I wanted to try summarising my review into one paragraph for a change and also because I couldn't think of as much to write about as I normally do.

Spoilers ahead!

It took a while for me to wrap my head around that ending, until realising that the Goodwin recieving the email isn't the Goodwin that the Captain was talking to for the rest of the movie, it's actually the Goodwin in the source code reality. Also I was annoyed that I couldn't rant about the major logical flaw that I saw in the concept because the ending basically explains it (I was going to say how Sean's 8 minute short term memory somehow allows the Captain to go anywhere and do anything despite it not being in Sean's memory for him to see, but then the film's like actually it's an alternate reality, which was clever because I didn't see that coming even though I should have).