Can we please draw a line between learn to play issues and balance issues? I really don't think Mark Target falls into the first category. It's a strong ability yes, but it's easily avoidable and reasonably priced. You can say this about every second ability in this game. Shall we now refer to all of them as overpowered?
Its ironic that you want to divide discussion between l2p and balance issues, but then you immediately afterwards make a L2P based argument yourself, namely that "its easily avoidable".
A) There is nothing easy to avoid about a point and click ability. Simply activate and click the armor.
B) As to avoiding the actual effects of the ability, there is nothing "easy" about that either. It forces that armor unit iout of the engagement and off the field into hiding for the full 60s of the abilities duration.
C) As if that wasnt "non easy" enough, you cant even effectively hide that armor for the duration, because its being tracked from the air by its own dedicated Recon plane.
The net result is that for 80 Muni, you effectively win that engagement vs armor, either by outright dmging it for +50% if it is stupid enough not to retreat, or by it simply having to retreat and hide for the full 60s., giving Sov free reign to advance. Not that you can even hide it, because you know where it is for that full 60s.
Imo this is definately in the top 5 most powerful Sov Commander abilities.
Really, a player with this ability should be using it everytime it is off cooldown.
Its that good.
As to what kind of adjustment it needs, I see many options such as an increase to 100 Muni, or reducing its dursation, or changing it to a Penetration buff, or removing the Recon element (which also incidentally does general Recon for you too, whereas Recon alone already costs 80 Muni normally).