Captain Britain Betsy may have a lot of potential. However, there are reasons we don't like her being CB up to now because it seems to neutralize all her previous development in the Asian body.
Firstly, her personality changed greatly as she is no longer being a bad ass and lack confident. I don't really see the reason in this because their bodies aren't so much difference beside the skin and hair color. Also, the other mutants have already known this issue for a long time so I don't think there would be much embarrassment. The only reason I can thought of is, does Betsy think the Asian body is better than her original White body?
Secondly, She seems to lose all the fighting skill of the Asian body and the prove is her 'fighting abilities' in the official power grid as Psylocke was 6 but dropped to 4 as Captain Britain. Does this mean she lost all her skill as Ninja as we have seen none in Excalibur?
Thirdly, Telepathy is her mutant power and best trait. Usually, mutants with powerful telepathy comes with a weak body like Xavier, Jean, Emma...etc, so they needs to rely on their mind as their bodies are weak. But right now when Betsy given the power of CB by the amulet or starlight sword, she rarely use her mutant power anymore(mainly just for communication or make her brother behave) but rely on the CB power. However, none of the CB power is impressive so far that many people actually wonder if Betsy has all those CB power until we saw the boost in power grid of the official handbook.
Lasly, remember her duel in X of swords, that is actually the most embarrassing moment in Betsy's history...We don't mind that she lost but please at least give her a good fight. From what I have seen, she used her shield to push her opponent once and then got shattered into pieces by the starlight sword. What the hell? Tini Howard can never be a good writer in Marvel Comics if she can't understand mutant abilities and write some good fights or clever use of them.
So, unless the questions and issues above are answer and solved, I can't support her as CB. She was so great in Disassembled and that is the perfect Betsy/Psylocke in her original body that we have been looking for..