Some Celtic supporters have an irrational hatred for WGS.
Personally, I'm still quite astounded at what he achieved.
Arriving after Martin O'Neill had quit, leaving a demotivated squad on fat salaries (Bobo, ya big shyster), the King of Kings lost to us forever - the whole mood around Celtic was mournful and one of resignation.
The Huns, remember, were still shelling out big bucks for players and we were still bemused as to how, but many were demanding we competed with their self-destructive lunacy.
So in comes WGS, former Celtic tormentor, media agitator, outspoken, single-minded, blunt and gets pumped out the CL by Artmedia in his first game(s).
Then, against all odds, given his remit and tools he had to work with, he wins poignant titles and miraculously gets to the last 16 of the CL TWICE, beating European Champions along the way, only to be thwarted by unlucky draws. (Milan and Barca iirc).
With hindsight, everything taken into consideration, he actually was a bit of a miracle-worker. His set-up was criticised but he was stretching out a thin squad, making the most of capabilities and energy. He delivered us Nakamura and JVoH, and got the best from Scottie McDonald, made average players good enough to compete at the top-level.
I always wonder what he could have done with some real decent budgets to work with but by his time we had made the pertinent if not popular decision to withdraw from the arms race and get solvent again.