Colossal was a good movie. You should see it if you can stand romcom's and like gigantic monster movies.
One thing I really liked about it is that there's a MAJOR plot point that they don't spoiler in the trailers! So something unknown was truly unknown until it happened. But seeing it at the Drafthouse had a part of that section after the reveal as part of the pre-roll was just odd cause it was just a bunch meme videos on the internet.
TLDR: Colossal good, go see instead of F8