Absolutely not. Every single morning the j0kers get on and horde half the map, If the map is small they will roll it. Many times they have rolled multiple maps. ENY gives us half a chance to defend.
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Let's put em Sopwith Cammels! That will teach em!

In all regards, normally, an abundance of airplanes with decent pilots are going to beat 1 superior plane in the sky. That being the pilot isn't a complete Ace, which many are not. Unless you fly a Temp or a Ta152 or a 190D, you generally won't be able to outrun most planes. When you get a gang on you, if you cannot out run them, it's pretty much over.
The biggest reason why the Jokers take all of your bases is because of your side's or the 3rd's teamwork.
When your side doesn't have the teamwork, or even enough players to combat the other squad, ENY doesn't really matter.
Now, if the maps were designed smaller where the Jokers had to face an opposition in order to capture a base, maybe ENY would work. The issue now, is that they can reup at another base across the map and basically avoid most opposition, thus flying higher ENY planes, but still capturing the map as there is little teamwork agaisnt them.