Well, it's a matter of preference and tastes. I can't stand the ribbon interface introduced in MS Office 2007.
I'm not familiar enough with Asian/Complex Script language, but I once was in China and have installed a few Ubuntu 10.04 (brand new at the time) to a class of PCs where students were struggling greatly with Chinese version of Windows. On Ubuntu they were quite happy with how pinyin support worked in OS and LibreOffice.
I don't do Asian scripts, just latin and cyrillic, but I still use WPS office, since a lot of the options are in exactly the same place as they would be in MS Office, it's so nice not to have to go searching for things.
I use WPS Office (not open source) on Ubuntu mainly because it supports Asian/Complex script much, much better (as in, almost identical to MS Office).