I would personally rate this a 4/5 as I am a huge Lego fan, but I'm writing this for other people. Honestly, there's not much to recommend this game. You seriously just play around in various worlds. After you get "Master Builder", there's not much more to do. You can get bored easily if you don't want to just mess around.
I found that there's fun to be had if you want to play around. 7 year old me would have had a lot more fun than 30 year old me. It's obviously a kids' game and I would recommend it for kids. Consequence-free messing around is fun. I feel like kids will love this!