At low levels I'm finding materia to be largely a waste of time. The issue isn't that you can't increase your stats, but that you can't increase the stats which matter. It seems every item has an upper limit to how much of a particular stat can be added, and low level gear seems to sit close to this cap. After being repeat attempts to attach mind materia to my various gear for Conjurer it was clear that none of my gear would benefit from it (getting a +0 bonus).
When melding gear, you have to consider the reduced effectiveness when adding it to stat-heavy equipment, and in the early levels where you're more likely to see +1 materia rather than anything higher, it doesn't seem worth the effort. Still, you can always pile on different stats if you're so inclined, just don't expect any significant impact.
FFXI: Siren Server: Seiowan Lvl 99 WHM, SCH, BLM
FFXIV: Ragnarok Server: Lemuria Glitterhands All Classes 50