I don't get the hate for This Is How We Do, that ending is just...

I do not want Legendary Lovers as the next single tho, I think it should've been the second single and not that Unconditionally mess. The perfect era for me would be: Roar > Legendary Lovers > Dark Horse > This Is How We Do > Spiritual/Walking on air.
Also, don't you guys thing that Prism was intended to be another kind of album? You know, the first thing we heard was a more mature Katy, then the YT trailers, her looks... but it just look like a more focused Teenage Dream. I think the concept of the album was changed late, but some of the initial songs like Roar, Dark Horse and Spiritual, that fits the darker atmosphere, were left in.