For one, I disagree with the purpose of a presentation program. Sometimes you just want speed. Secondly, if you see a presentation which does is not nice it does not imply that the presentation program was at fault. Lastly, I don't find LaTeX easy at all, though you didn't specifically suggested that as a good presentation program (right?).
Include a chart/graph/table from some other program in your presentation program and it is going to look out of place (different fonts style/size, it being a picture instead of vectors, etc). A program can also do so much.