Sorry you feel that way.
I find Fusion rifles to---once again, thanks to Update 2.0----be a highly effective weapon. Especially in the new PvE environment for strikes/stories/CoO where Bungie is always trying to force you to fight in a BOX so you can't stand off and snipe like you did last year.
The fusion rifles----especially Telesto----are great for stripping shields off of Tier 2 enemies, and reaching out and hitting powerful enemies at mid-range before they can close to short range where they have the advantage.
The Telesto itself can almost reach long range because its cone of fire is so narrow.
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.....but it's not a sniper.. and it sucks in pvp :/ and anything you can do to mobs with it you can do with a decent primary.
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Can be done. But not as fast and not as safely. In many ways Telesto is a combination of Thorn and Fatebringer.
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Primaries can't generate orbs like the Telesto does. Multi kills are pretty easy to pull off with it, more orbs = more supers.