Adam Pawlus just mentioned how at the time, 300th Fett was top notch, and I tend to agree with that idea, but it still doesn't place him high on my list. The figure just fell flat and was the start of a nasty pre-posed trend later on...
We see his style of sculpting, his features like a working holster and such, in todays figures... Hasbro just wanted to milk a little extra through the packaging I think.
POTJ had a ton of great figures though... Amanaman, Imp. Officer, R2-Q5, R4-M9, Duros, Bespin Guard, Bo Shek, Zutton, Luke Bacta... These are some pretty good figures that I'd rate above 300th Fett personally.
Too bad Fett wasn't something special. I'm really anxious to see this "vintage" OTC one though. Whew... Should be amazing.