My 2 year old LOVES Blue's Clues, and saw every episode while it was free on Amazon Prime over and over. I'd rate that show 10 stars. This movie, however, doesn't quite capture the show's level of excellence. Probably because it's trying to stretch the exact same elements from 25 minutes into an hour plus long movie and you can feel the middle dragging.
Okay, first the good. Almost all of the characters from the TV show (at the time this movie was made) are in this movie and it's fun to see so many of them together. As always, Steve, our sole live actor, does a fantastic job! As a unique twist, Steve gets a chance to find a clue (rather than the audience pointing them out to him).
The bad: The boring middle section. In the middle, Steve gets a music lesson and I think it's something like 15 minutes of lesson. My two year old got bored at this point EVERY TIME we watched this. He'd wander off. And it isn't the length of show because he'll watch episode after episode in a row if I let him. It's just that the music lesson isn't engaging, either visually or any other way. In the end, I've taken to skipping it for every showing. That's a large chunk of this movie that's "wasted".
Overall, this isn't a bad movie. For a 2 year old, I'd say it is probably one of the best things out there, actually! But if you have to choose, I'd highly recommend buying the episodes over the movie.
