United were a mess when he arrived, a basket case of a club.
Also it had a huge drinking culture as well with the likes of McGrath, Whiteside and a few others.
Took him about 2-3 seasons until his team took shape, when it did he won the FA Cup and didn't stop picking up trophies from then on.
United saw the changing of the wind in football in this country and took full advantage of the commercialisation in the PL era with the mega store, merchandise and sponsorship, they left every club in England and Europe in its wake which gave United unprecedented spending power.
Only blot on Fergie is his CL record, he was in the CL 22 years and only won it twice, and both those finals were very fortunate, he should have won 5-6 in that span , in that era you had teams like Monaco, Leverkusen, Valencia and Dortmund getting to Finals, 3 of those teams also knocked United out in the semi finals. He did show some tactically naivety at times in those campaigns.
I remember one thing that stuck about the brilliance of Fergie, he'd got knocked out early in knockouts when Veron was there who was looking a transfer flop and post match he was asked about Veron and Fergie said we bought him and moved from 442 to 443 because this will be the formation every club will be playing in Europe,how right was he years before that happened, the next decade it's became the default formation of the elite clubs in Europe.
He definitely one of the greats of the game, the longevity, the multiple rebuilds and his bravery to play youngsters.