Ehh, I appreciate the diversity of United, but It's Never Been Like That has way too many great hooks to be disregarded as "run-of-the-mill indie rock". And come on, most of the stuff from that sector isn't that poppy.
Alphabetical is awesome, it's just a little mellower (and more electronic) than the other albums. Not a bad song on it, arguably the most consistent of their albums from beginning to end. And the song If It's Not With You reminds me of Steely Dan a lot.
I thing Wolfgang is probably their weakest simply because it's the first album that sounds like the others before it (and to me is guilty of what you accuse It's Never Been Like That as being) The first three are all completely different.