I don't know *what* it is about this theme, but I just don't like it :/ The buttons just aren't interesting or uniform in some way, aka Mozilla Modern (the old green version OR modern purple!), IE5 (black & white->colour), or my favourite, Camino.
Also it uses those dark arrow buttons from Qute Thunderbird (from reply/forward) in refresh and somehwat back & forward trying to copy OE I guess--those don't even look good in OE
! I just like a well defined shape like the arrow like in Mozilla Mail/Modern I guess, or the circular reload button in Mozilla/Modern...
My favourite of those types of arrows would be the blue XP redobutton though; it's thin and not dark like OE's/Qute's.