"Obstructed"
I don’t think this is a mesmer specific problem, it just LOS in general that has trouble dealing with anything but horizontal attacks. In PVE, most of the time your are on the ground fighting something that is on the ground, although as you pointed out sometimes minor dips in terrain will cause it to be “obstructed”. In WvW, taking advantage of high/low ground is more important, but the LOS system in this game doesn’t seem to handle it so well especially when trying to shoot up at something. I find it nearly impossible to hit single target spells on anyone sitting on a wall, even if there torso and legs are in full view. It seems like it would require an entire redesign of LOS, which i don’t think is on their agenda right now. For the moment, ground-targeted aoe and melee cleave will continue to reign supreme.
(edited by rfdarko.4639)