How are people complaining that you cannot make a viable INT/PER/etc fighter while at the same time complaining that attributes don't actually do anything (and a character with 3 everything is viable). Those are contradictory statements.
And the IE AD&D games didn't have any attribute choices - if you were a melee fighter you took Str/Con, ranged you took Dex/Con, and if you were a wizard you wanted Int so that you could copy spells. D&D 3.X is worse except for a few MAD builds (which are generally considered weak). Casters go 18 in their primary stat, and the rest in Con; Fighters need Str/Con and then Dex/Wis, Monk is royally screwed in tabletop play but works out in CRPG due to heavy combat focus and lots of helpful custom items.
Furthermore, if you are cribbing from D&D, point buy allows a distribution of 8 - 18, not 3 - 18. The +5 difference is pretty large on a d20, but if you were to go 14's across the board the character would still be fairly effective, just not optimal. Excepting spell-casters, of course.
Ultimately the impact of attributes in PoE are diluted, and there should probably be a bell curve for the effects of the stats. So that high and low attributes feel more meaningful. In no way is this "fundamentally broken".
I think Obsidian should take damage out of the equation altogether, though - too troublesome to deal with unless it's very gently curved. Find another use for Might. In general all builds are working towards dealing damage as this is, at its heart, a tactical combat game. Damage can be sourced more subtly from accuracy, interruption and duration attributes.