West Ham got their first points of the Premier League season by claiming a highly impressive 3-1 win at Goodison Park.
Everton, who were without a host of first-team stars, struggled at home but still had several good chances to get back level with the Hammers.
Cenk Tosun and Oumar Niasse both missed golden opportunities for the Toffees, much to the annoyance of Silva.
He said: “We didn’t play with enough quality to win the match.
“We didn’t play with enough quality to win the match”
Everton boss Marco Silva
“We started well with good pace and intensity, but we made mistakes, and at that moment we didn’t react well.
“But even after the 1-0 we had a clear chance to score, we didn’t perform well, but they had three chances and they scored three goals. We had four or five chances and we scored one goal.
“At this level we have to take care to always be in a good position and create more chances.
“It’s a tough result for us. A club like us to lose 3-1 at home is always tough. We have to react – there’s nothing more to it. We have to react to the mistakes we made.”
At 2-0 down Silva substituted Morgan Schneiderlin, whose father died in the week, a minute before half-time but the Toffees boss insisted his decision was a tactical one.
“I know what has happened but he was ready to play,” he added.
“It is not because of what happened or because of the performance of Morgan. He told me he was ready to play and he has all my support.”
Andriy Yarmolenko fired West Ham into a two-goal lead after 30 minutes with a fine double – his first goals for the club.
Gylfi Sigurdsson powered home a header on the brink of half-time for Everton but Marko Arnautovic put the tie to bed on the hour mark.
Everton defender Mason Holgate said: “It was massively disappointing. We went in expecting to win so it’s three points dropped.
“We started well and then they scored and after that we were shaky. We would have expected to create more chances, too.
“Losing 3-1 at home is never good enough for us, especially, with respect, against a team who didn’t have any points yet.
“I just think the whole performance was disappointing from our team point of view.
“But it’s still early days with the new manager and I think we’re good enough to turn it around.”
Everton, who are currently tenth in the top-flight table, make the trip to north London to face Arsenal next Sunday.