You'll find that especially at low level pretty much everything is garbage. Affixes have a minimum level requirement, kind of like how higher level items in d3 are inherently better, which means items below level 60 or so just simply cannot be any good. I usually pick up slots that could be upgrades for me, like if I know I have especially awful gloves I'll pick up gloves but leave the rest. Once a league has been going and I'm making alts I usually pick up nothing, right now my latest ranger is level 36 or something and I have yet to pick up an item on her except for some amulets.