I was never really into Shaun the Sheep when I was kid and I also didn't enjoy this movie as much as I would if I was. I probably had the same problem with this film as I had with minions. It isn't bad idea but it's too much minutes for too little words.

Shaun the Sheep is great idea but much more enjoyable when it's in seven minutes instead of 85. I think that story had too slow tempo for how long it was and I also felt like I already saw it because the story wasn't really original when it comes to it and also gags in this movie weren't really that funny. I think that even 5-years-old are already full of this same kind of jokes.
I personally enjoyed "emotional part" of this movie more, than I enjoyed the "funny part".

On the other hand I really loved animation and soundtrack of this film which was truly briliant and one of the factors why I had energy to finish this movie because without it I wouldn't do that and for me, the last 15 minutes of this movie was the best part.
The idea was great but they should have worked on it more.