You don't "need" minimise or maximise buttons I guess because you drag the window towards the bar at the top of the screen and it maximises the screen and if you drag it away it minimises. Also, if you right click on the window bar it has a textual menu option.
I don't think that's the worst part. The worst part is having to go all the time to the edge of the screen to bring an Expose like screen which displays all open windows. It's flashy and fun but it's a waste of time. I guess.