I stopped playing after 4th edition, but regarding 3rd edition I'm surprised about Mr Priestley's comments given that I do appreciate his rules writing capabilities. ( Almost as much as Jervis Johnson's , I love epic :) )
I loved third edition WH but we always had issues with magic..
The standard magic system in 3rd edition, while a good system in the mechanics had the problem for us that it seemed unplayable due to the spells. I used to play undead and nobody wanted to use level 4 magic because we had such spells like the one giving a S3 auto hit to every model on the table !!!
At some point the rumor got to us back in Argentina that in the tournaments they were only using up to level 2 battle magic. Assuming this was true, and not an evil jocke by brits to us argies :) the problem with that is that battle magic level 2 gave a ton of tools to destroy undead troops while giving no recourse to them.. so then undead became unplayable..
The final maybe not directly related thing was the magic attributes of weapons, the combination could be impossible, frostblade with some of the ones giving many attacks meant unit killers..
Because of this while we kept playing 3rd edition when 4th came out we started using 4th edition magic system..
I wonder how other people saw third edition magic, and wonder if Rick Priestly saw some of this issues or they were addressed by the gaming community in a particular way..
Quite and interesting topic by the way , even if I haven't played WH for such a long time.. I still have my 3rd edition book, army list and siege on the book shelf.. my favorites books ever…
PS: is there ever going to be a Hail Cesar fantasy :) that would be nice …
cheers
Francisco