Washington played the 96 final against Krajicek, who beat Sampras. Here's a run through of Sampras's so called weak competition. Opponent in each final:
93: Courier, 94: Ivanisevic, 95: Becker, 97: Pioline, 98: Ivanisevic, 99: Agassi, 00: Rafter
I think Pioline in 97 compares favourably with Scud in 2003, except that Fed was still a bit tentative and finding his range then whereas Sampras in 97 was unstoppable at Wimbledon. 95 compares with 2015 for Djokovic. Fed hasn't really faced an ageing grass great to win a Wimbledon final so it's hard to find something comparable. Ivanisevic was just as tough and probably a bit tougher than Roddick for Fed. Agassi and Rafter are great grass players. Overall, there's nothing to suggest Sampras lucked out in Wimbledon, of all places. He wasn't the king for nothing. Didn't have an opponent of 2007 Nadal level but on an overall basis it isn't significantly easier, if that, than Fed. Fed's toughest finals have been in the years he lost...2008, 2014, 2015. So it doesn't prove much either way. Yes, Fed faced tougher competition in these finals than Sampras ever did but he didn't win either of them. Again, props for 2007 but that's just one final and it's not better than beating Courier/Agassi/Rafter put together. I say there's nothing much to choose between the two overall in terms of quality of competition at Wimbledon. Let's look at another player who won big in Wimbledon in the Open Era: Borg. Beat Nastase, Connors (twice), Tanner and McEnroe. THAT's tough; without Borg, Connors would be sitting on four Wimbledons so he kind cut him down to the level of an Edberg (as far as Wimbledon greats go) rather than above Mac. Of course Borg got disheartened after 1981 and ran away, which is a pity. But Borg's ability to be machine like in that era with those tiny racquets is quite incredible.