Disgraceful tackle. And was at the time too, even by the standards then.
As an aside, Gary Charles went on to have demons not too dissimilar to Gascoigne.
Gascoigne is an arsehole and someone to have sympathy for - they aren't mutually exclusive.
He is also not fit to compare careers and achievements with some of the other greats of the English game, whilst simultaneously being significantly more technically talented than most of them as a footballer. That's not a contradiction either. His pure footballing ability was off the scale. But, as others have pointed out, this isn't the only characteristic that goes into making a truly all time great footballer.
And, yes, in my opinion he was never anywhere near as good once he had that injury. In fact, I would say he was pretty shite, at the highest level, once he left Lazio. He was picked on reputation for too long before Hoddle binned him from England.