Guess I can contribute a little bit. A little surprised I hadn't seen this have its own thread, but eh.
I did not want to watch the movie when I first saw the trailer last year, if only because it's kinda creepy watching animated LEGOs do stuff and talk and all that. The television series freaked me out, yet I was perfectly fine with the video games--somewhat. But over time I kinda forgot about it until a friend casually brought it up a couple of weeks ago, and suggested we should go see it. I had nothing else to do, so I agreed, and that's what we did.
I didn't have any expectations for the movie, but I was genuinely surprised by it. I was not bothered by it, even though the humor was kinda out there (someone described it as friendlier Family Guy-esque humor) and I mostly gave the screen weird looks while laughing here and there (my friend and I seemed to have been the only ones in the theater who were laughing at stuff--we were pretty much the only young adults there, there were a couple of families and some old folks, that was it for a Tuesday afternoon). I must say that it's the strangest movie I have seen in recent years, but it was charming. The characters were also pretty good for who they were, and Batman did not steal the spotlight, which is hard to do in all honesty. The gags also worked, as everything came full circle by the end, as did the Chekhov's gun(s?).
This is a good example of a children's movie that doesn't bore its older audience. If anything, I think it was for the older audience more than it was for children (though more-or-less for a specific older audience). I remember playing with LEGOs as a kid, but I wasn't very creative with them, yet it still brought back some nice memories. And I'm surprised that Animal Logic, the studio that made Happy Feet (a movie I don't really like, frankly), worked on this film. I am impressed.
Do I recommend the film, though? Not really, as it does depend on your own personal taste especially in humor and geekdom. But the movie has a good plot, good pacing, and strong writing and characters that helps it stand on its own, so it does warrant a watch if one is looking for a good time and some nostalgia. If you feel you're not going to enjoy the film based on what you saw from .gifs, trailers, what-have-you, don't force yourself to go, or if you're a little bit interested, wait to rent it. Chances are people who wanted to see the film have already seen it by now (though it's technically the only kids' film out right now that's not The Nut Job and Frozen), so it will start to fall further down the ranks of the box office, or at least until Mr. Peabody and Sherman is released.
Spoiler:- slight, tiny spoiler that doesn't give anything away but still being tagged anyway:
Also, the twist has to be one of the best twists I've seen in a long time. It's really, really weird, but it works. I almost couldn't believe what I was seeing for a minute.
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I agree that the trailer at first didn't seem that amazing. I thought it would be an average movie; wasn't to sure what one can do with Lego pieces. Plus, the trailer made it look like there were tons of heroes mashed up in this one movie. Boy was I wrong! All those other guys pretty much took the same amount of screen-time as shown for in the trailer. It was nicely focused on a small group of fresh heroes, apart from perhaps Batman, and still did superbly well. It actually had a great story IMO, and like Kutie Pie says a great ending too. I really loved how they logically explained the whole Lego world(s). The final moral that it tries to teach is a simple & generic one, but nevertheless delivered properly. The animation too is most colourful! It's a great entertainer for both adults & children.
BTW, just thought I'd share some awesome Lego wallpapers that I came across.