A lot of people will concentrate on one or two favourite songs from albums and never listen to the rest. It's no crime. Listen to what you enjoy. The only thing I would say is that if you like a song by a band you may - not always the case but you may - like others on the album. Of course, it also happens that that song may be the best/only good song on the album, and listening to the album then disappoints you. Entirely up to you: again, I'm no VU fan. No ma'am, not me.
As far as ELO goes, in order I feel the best albums are:
Out of the Blue
El Dorado
Time
Discovery
A New World Record
Secret Messages
Face the Music
Zoom
Xanadu (split with Olivia Newton-John, otherwise it would be higher, but still worth listening to).
(I can't remember/am too lazy/busy to check if I already posted some of these, so bear with me if so)