Comment 28 for bug 1168281

Well I guess you can argue a lot about style and Eclipse in general. However this is how Eclipse E4 looks like. As far as I know, this is intended to look like that.

You still have a theme manager in Eclipse, if you are not satisfied with the default (Eclipse) theme. I guess the basic idea is to move away from what the operating system provides, and do it in a "Eclipse style".

Wheter or not you like it (I don't), this is nor an issue of Mint.