It's obvious that Yuna's sex appeal was astronomically boosted since X, but did everyone approve of this, or do we prefer the delicate, innocent respectable looking Yuna from X?

I was personally a little disapointed with her, she had changed so much, a completely different person... but was I complaining when she was skinnydipping in the hot springs? not entirely.
However I think this may have been one of the fundamental reasons why people didn't like X-2, Yunas character was just too different...