Saying it isn't a hindsight thread doesn't make it so. Some fans favored Watt when we drafted, and others Taco, and if you looked at college stats there really wasn't a notable difference except one was more of a 4-3 DE and the other more of a 3-4 OLB.
As for McClay, you aren't being realistic if you think he always makes unilateral decisions on who to draft, and this was just an exception where the input of others was considered. It's not that every good choice is all McClay, and every bad choice is all someone else. McClay's thoughts carry a lot of weight, but every decision is discussed and the choice is based on what the group decides. McClay has never been the sole decision maker.