A relaxing adventure at the edge between reality and madness, SH:A is not really a challenging game, but it does drip with atmosphere. While the pacing could be faster, the puzzles are varied and not recycled between the chapters, and the main gameplay loop was engaging.
Dishonored 2 was the closest experience to the original Thief franchize in many years, when played without powers. This game is basically impossible to play that way, especially if you're trying for a non-lethal ghost playthrough. Options have been drastically narrowed down, choice has been taken away, even the levels are not as well designed as in the original game. It would be forgivable if this were a DLC, otherwise, unless you're really dying to uncover the mystery behind the Outsider, you won't miss anything by skipping this game.