Sceptile's special sets are definitely its best ones, but I don't think SD Tile is totally worthless. I've been using it and have been pleased with it. The special sets are so common (and good) that the physical set actually benefits from this. It normally won't sweep through everything, but the lack of Grass resisting physical walls aid it. It needs a wallbreaker to lessen the need for SD, but paralysis support also slows faster threats should you not want to rely solely on a wallbreaker.
tl;dr: Physical Sceptile still works well, but the special sets (and august's set) are better overall