A single mistake? Sure. But one thing i learned playing WOTR is that you might think you are making the right choice, but you can't actually finish the game with your build.
Oh please I finished WotR with several unoptimized and "badly" build characters, including one which was build from level 1 for combat in gold dragon form (already a suboptimal choice) instead of using respec, meaning for 3/4 of the game all of his feats were useless. On normal difficulty.
