The optimistic view of the Giants’ draft class is that they landed two of the top-five players on their big board, their No. 1-ranked available player entering the second round and multiple starters on both sides of the ball. The pessimistic view is that the Giants drafted an edge to play linebacker, a tackle to play guard and traded away too much for a part-time receiver. So, which is it? Draft weekend is a time for optimism, right? Here are The Post’s pick-by-pick grades for the Giants’ draft class: Round 1, No. 5 overall: Arvell Reese (LB, Ohio State) The Giants’ management felt like they hit the lottery when Reese — the top-rated non-quarterback on their board — was available. Not too many simulations resulted in that outcome. Reese was a one-year starter as Ohio State’s high-upside chess piece. He is NFL-respected coordinator Matt Patricia’s developmental brainchild.…