Look, I still say the Katy Perry version is better. It objectively is.
That does not make the MGMT version of this song, the original, not good. It is. Really good. It is a trippy, fuzzed up trip that served as the group's first worldwide hit.
The song - an electric tale of love - is incredibly complex, and takes a fair bit of skill to perform. Which is why it's really impressive to see performed live.