No.
Chibi-Usa holding a gun to Usagi's head was one of the best scenes of the series. The 'Clash of the Ten Warriors' fight to protect Chibi-Usa was the best fight of the series. But I find the deceitful/obnoxious child archetype to be extremely annoying, and can only handle it in an antagonist role. The moment Chibi-Usa shifted to being a main character, I started wanting her gone. Also, I had trouble buying Usagi's transition from hating Chibi-Usa to being willing to die to protect her. For a while I was even considering using phrases like 'jumping the shark', but then they gave me an Ami episode and I calmed down.
I think she could be an interesting character in other circumstances, but with non-fight screentime being so precious and my aforementioned hatred for that particular archetype, I'm afraid I'm going to have to stay in the 'DIE SPORE DIE' camp.
I hope have I haven't unsealed some sort of ancient flame war by responding to this!