If the best results in 50 years is 'okay(ish)' you are clearly a tough person to satisfy!
If England managed to win the Euros or World Cup (even if by a fluke) then there won't be many people saying that the victory doesn't mean anything to them because they didn't like the style of football.
So, to be clear, the bar for calling Southgate as success is not only to win a major tournament but he must also do it whilst playing attractive football? Anything else is failure. Glad I don't have the job.