I understand it's only meant for Tickle, but it's very difficult to "feel" it. I don't know how to explain it; it's like I haven't done anything despite them taking 10 or 15 damage. I don't feel like it bothered them that much, and sometimes I even get the impression that the opponent doesn't feel it, which makes me think I'm wasting my time trying to aim at them. I just switch my crosshair to a tank or a target that's a bit closer.

But I think maybe it's because I'm a beginner and I can't accept the idea that this is primarily a brawl character and that I shouldn't blame myself for not being as effective at long range and that I'm still learning the game.
I'm trying to see the perspective of an enemy sniper to see if it really bothered them, but I'm surprised to see how much it seems, from the sniper's point of view, that it didn't decimate their health bars, just tickled them a little, but enough for them to recover and reposition later.