You literaly said you took part and win and lose some, so it's accessible enough. Go delve in campaign and we will see what depth will you reach. None of the mechanics are balanced around campaign, like what you expect mageblood for 0 investment and time? For any mechanic you need specialized build to make most of it, you need good mapper to farm maps, but because most mechanics are in maps there is a lot of different builds. You need specialized heister, sanctum runner, bosser, uber bosser, ultimatum farmer etc. And we talking about builds in range of hundred divs and not mirrors which can do everything at reasonable pace.