Maximize the window and watch as the title bar that used to contain the page title is now empty. Then move the mouse all the way to the right and try to drag the scroll bar. You have to move it a single pixel to the left or you can't grab it. Then there's how it stick out like a sore thumb on your desktop due to it using its own toolkit, but Firefox is kinda crappy in that area as well, only just not quite as much.
I assume those are all Linux-specific issues.
I mostly hate it for how it set the standard in bad UI design which Firefox felt they had to copy. At least I can mod the status bar right back into Firefox.