I wouldn't classify the two as useless. Just that the roles they play are done better by other classes.
[You must be logged in to view images. Log in or Register.] (i know i know, semantics)
Brell's line and ranger buff line are the biggest contribution they have to a raid setting that no other class can fill. You're looking at one of each then just for buffing purposes.
Downside, these spell lines don't come in until Velious. Upside, it's a slight swing in their favor once Velious launches.
Regardless though, it's more important that you play a class that you enjoy. You'll be more likely to stick it through to max level and be happier overall thus making those around you just a little bit happier as well.