Was Charles Foster Kane a loser?

He was certainly a man who became the victim of his own ambitions and success, achieving his desires while sacrificing what he perhaps most needed. When wealth allows the acquisition and control of just about anything, everything can lose its value. 

Not in the pathetic sense, just more like an asshole.

Depends what you mean--He certainly wasn't a loser regarding being successful and acquiring wealth, quite the opposite--But(like Charlie Sheen's mental breakdown in 2011))he certainly was a miserable person who was still not satisfied with his life despite fame and fortune---All he accomplished, perhaps ruthlessly, ultimately didn't matter to him as he grew old, lonely and dying--The innocence and fun he had as a child sledding down a snowy mountain was still his fondest memory

Charles Foster Kane was the Donald J. Trump of his age.

CFK accumulated an enormous material wealth, but in the end he didn't have anyone to share it with. He died as a recluse, estranged from his friends and without family. I definitely think he was meant to be seen as a sad and tragic character.