Despite an official attendance of 59,131, there were empty seats all around the Emirates with a number of season-ticket holders seemingly put off by the Gunners' disappointing league season.
Goals from Shkodran Mustafi, Henrikh Mkhitaryan and Pierre-Emerick Aubameyang ensured it was a comfortable afternoon but it could have been slightly more problematic had Troy Deeney converted his penalty.
"We're always playing for those who come and support us, (those) who are really coming and supporting us are real fans. But our job is to perform and stick together in important moment and get the fans back on side with our game".
Arsene Wenger saluted Petr Cech's reaction to his poor display against Brighton and Hove Albion as the goalkeeper went from "hell to heaven" in a week by playing a vital role and reaching 200 Premier League clean sheets in Sunday's win over Watford.
Aaron Ramsey and Laurent Koscielny were rested, with Jack Wilshere only on the bench, but the gamble paid off for Arsenal.More news: Serena sets up Indian Wells showdown with sister Venus
"And Mourinho's inability means praise has to be directed at Wenger for coaxing a series of effective performances out of a player who appeared truly woeful just a couple of months ago".
Mkhitaryan laid on Aubameyang's strike against the Hornets before the roles were reversed for the third goal.
Fair play to Deeney for fronting up when he knew he would get a lot of abuse for missing the penalty.
Defeat keeps Watford 10th and nine points clear of the relegation zone.
"I have to watch what I say, but it's [having] a bit of cojones, is what I'll say". "I didn't play a lot in January so it was hard to find the rhythm", he said.
"They all just backed off".More news: Area Steel Company Will Take a Big Hit From Trump Tariffs
And Aubameyang added: "I think the team did very well and we are all happy". He played multiple times a week for Dortmund, but at Arsenal, because he is cup-tied for Europa League games, his outings have been more sporadic.
"He had to wait a while to save a penalty first of all", said Wenger after Cech's first spot-kick save since 2011.
"I believe in two weeks, his situation shows how football is".
The Gunners have now scored 1000 goals at Highbury and the Emirates, only the second team to do so after Manchester United. 432 Premier League appearances Years Active: 2004-present Clubs: Chelsea, Arsenal Having recently accepted blame for Arsenal's loss against Brighton, Petr.
Cech registered his 200th Premier League clean sheet, the first goalkeeper to achieve this feat in the competition's history.
"When you have a run of negative results and it carried on from the Ostersund game at home and in the league".More news: Honor 7C With Snapdragon 450 SoC and Android Oreo Goes Official