I've been using them for a little while and I've noticed that when I throw them at players, they would hit a player, but then proceed to curve away from them, as if the guardian had some sort of force field. Is that supposed to happen? I've had them stick to players before, but I don't know why they don't stick 100% of the time.
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Maybe lag or a titan with juggernaut. I've never had any problems with fusion sticking. In fact, sometimes it tracks so much I'm like "oh, that should have missed...I don't really deserve that kill... BUT I'LL TAKE IT! :D"