While I've never been to a mass with the homily in Latin, I've had a few with the readings in Latin (including Monday's mass two days ago), which always annoys me a little because it's immediately followed by the translation in the local language.

Personally I prefer the Latin mass, but one change I'd like to see would be for all the texts for that day to be read in the local language, not just the Epistle and Gospel (among other changes).