We knew we're on a hard run at the moment, we had to look at ourselves and we had a big result in midweek in Milan and I felt we carried the determination into today.
The duo are among six changes with Wenger having one eye on their Europa League last 16 second leg tie against Milan on Thursday holding a 2-0 lead.
Deeney's effort was saved, however, by goalkeeper Petr Cech - and Bellerin took to Twitter after the match to ensure that he had the last laugh.
The Gunners doubled their lead shortly before the hour mark as Mkhitaryan drove at the Watford defence and released Aubameyang, who rounded Karnezis and fired home.
And combined with a 2-0 win over AC Milan on Thursday, Keown reckons the Frenchman is closing in on being fully dressed once again.
"It is an unbelievable personal milestone, but the most important thing is to win and so it was defeats that were more frustrating", said Cech. "It gets us out of that negative spiral we were in", Arsenal manager Arsene Wenger told reporters.
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Watford pressed Arsenal back into their own area as the first half came to a close, but they were unable to equalise.
'We had a nightmare week so we have some work to do but overall we are in a good way.
It was also his first spot-kick save in England's top flight since February 2011.
Ultimately, it was the Gunners who were smiling following their 3-0 victory, but arguably the loudest roar of the afternoon from the home faithful came when the Hornets skipper saw his second-half penalty saved by Petr Cech. They attacked well in the first half, and an eager Ozil looked frustrated at times as he failed to make anything of a couple of decent chances, at times hindered by the quality of passing from his team-mates.
It was an early statement of intent that Arsenal were not here to be bullied: Adrian Mariappa lost his man, Jose Holebas was simply outmuscled, and Mustafi's header was hard and summary.
"It was a bit frustrating but we have eight games and we have to make sure we win majority".