Okay here is my $10 worth not 2 cents

I've played for over 8 years and now I pretty much only fly Fighter sorties in the MA. I use to do bombing and tanks, but blahh boring to me now... was 2nd rank years ago in fighter rank and overall rank (not bragging) in the MA so I know how score and different types of fighting styles work in the MA and DA.
Main arena Tactics Generally, they key to a good Main Arena Fighter pilot is the ability to get as many kills in one sortie as quickly as you can while being a precise/accurate shooter and then landing your kills every time you take off. (fighter rank score summed up in one sentence). Now... you may think that guy who is #15th fighter rank is pretty good (not actual 15th guy, just example) but how does this guy get most of his kills? does he hide 15k in a p51 and swoop and cherry pick kills - BnZ method. Does he fly dead on into a furball in a 109g14 out fly the crowd pick some kills and dodge BnZers - furballer method? He probably does both. His situtational awareness ables him to get kills while out maneuvering enemies that engage him. Now, does a BnZ pilot who lands and gets a lot kills picking and running make him a good fighter pilot? In WW2 hell yes! In AH, that is partial. Can the guy fight 1 v 1 in a situation where an enemy is chasing and catching him. How well can he reverse an enemy? The problem with the MA is that you tend to get 2, 3, or even 4 enemies on you at once. If your plane isn't fast enough, can you reverse them and possibly get 1 or 2 kills before you die? So lets not look at score, because for example, my fighter rank is 27th, but I die 66% of my sorties. Does that mean I am a bad MA pilot? No, I still have a 2.6 K/D. I just typically do not like constantly flying and running away (my style is furball/thrash/reverse-kill) But I use all of the styles. Granite I don't try for rank anymore. A good MA fighter pilot has the ability to get kills in almost every plane. A good MA pilot has the ability to use different fighting styles given the situation. A good MA fighter pilot can reverse, use ACM, and turn fighting skills to beat enemies who have the advantage. EVERYONE who flies in the MA has to cherry pick to get kills. The MA is unforgivable when it comes to who has the advantage in a fight. So how well can you reverse enemies, how well can you pick kills, how well can you fight 1 v 1, how well can you fight 2/3 v 1, when do you use some maneuvers compared to others in certain situations, how well your is your SA given the fighting style (like if your in a N1K2 surrounded by mostly p51s and 190Ds), how well do you use E management, and , and
how many kills can you get before you land or die. These are what makes good MAers.
DA tactics. The point of the DA is to have a fair 1 v 1 fight. Same alt, same plane, same gas, same ammo load out. The reason why so many people call out pilots in the MA to fight in the DA is because IMO the actual skill of fighting, acm knowledge, and plane knowledge is accurately depicted in a 1 v 1 fight. The general amount of pilots in the MA can BnZ and pick easy kills and run away all day long. But do these players have what it takes to actually win fights 1 v 1 when the conditions are the same. The general amount of new players believe that the DA is a ground and pound, slowest wins, who can our turn the other guy. However, the DA is perfect for learning all of the styles. You do not have to turn n burn every fight, if you know how to use E correctly in the same planes you can eventually BnZ them (ask EACE). the DA helps you learn how the planes actually fly. It helps you learn how to aim, it helps you learn how to manage E, and stalls, It helps you learn how to use the plane to its full potential, it helps you learn how to use reverse tactics, and helps you learn how to use your views correctly. The only thing you cannot do in the DA is run/HO. So this is why a lot of players challenge others to the DA, they want to see if they player actually knows more skills other than running away or HOing every chance when they lose advantage. I love going to the DA because believe it or not, it will make you 10X a better MA pilot. I have flown and fought against many of the best sticks in AH in the DA, believe me, i had my fair share of getting PWNed. But I learned from them through flying in the DA and learning real ACM, and throttle control. Now in the MA I know how to handle most situations given my E and their E, how to out maneuver them and how to gain the advantage, all from fighting top sticks in the DA 1 v 1. I think most of the MA sticks who do not fight in the DA, do not have half as much ACM skill or ability to win fights without an advantage. If your only style is BnZ and you do not ever learn ACM or reverse tactics. You are kidding yourself if you think you are a top AH stick.
Hope this isn't too long but there is a lot to know