There is already steam's list of best singleplayer tank simulator games. And if you are still asking, that means you discarded all games from that list.
If you explain why you discarded them all, or at least you will name several games and explain why you discarded each of the games from these several, then it is possible to start composing a new list of games, some rare games, that are not in that list, but which will fit your parameters of discarding.
Also, you still didn't explain by which criteria graphics is considered as high quality? How to make a conclusion if in any given game have high graphics or is it only average?
Before you clearly explain this criterion i can't make a conclusion about which game has high graphics, and which does not. So how i can suggest anything then?