I don't think that the 190A's are good in 1-vs.-1 MA-style play; but they can be great in many-vs.-many, especially in scenario-style play at about 25k on down. (Also, they are excellent vs. bombers.)
The thing that makes them good in that environment is the combination of roll rate, speed, handling at speed, acceleration with WEP, firepower, sturdiness, and ammo load. But of course it can depend on opponents and type of fighting, too.
In Enemy Coast Ahead, the scenario that just finished up, the 190A-5's did fine. Now, if it is against P-51's at 34k, it is problematic; but Enemy Coast Ahead was a 1943-style Channel Front battle, from 24k on down against Spitfires and Typhoons. There, the 190A-5 was quite good in the time period it actually flew and against some of its historical adversaries.