Basically, a monkey could FLY the A-10C in a straight line but Einstein would have trouble with the Black Shark in straight and level flight.
Ok, maybe I have over simplified. The BS is a b!tch to fly and fight in and requires you to learn the BASICS before you can even take off. The weapons systems sometimes don't make sense and you wonder what they were thinking when they designed them.
The A-10 is a straight forward fixed wing aircraft to fly ie. if you have flown an aircraft before it's the same as that, but there are a lot of systems to learn and master but will be similar to ones say in F4 AF or BMS. There is a lot to learn here but that's why we do this, right?

My vote would be for DCS A-10C as it is the best sim I have flown and yes it is compatible with Black Shark 2, not with the original Black Shark as there was a pay-for update released recently to update it.