Advocaat underachieved overall and looking at it in list format doesn't really describe the chaotic feel of it, eg despite paying a fortune for tugay, he was never his first choice, he wanted to sell him from almost the minute he came in. The Christiansen signing was very weird, he had never seen him play, but forked out millions rather than bringing in smarter short term cover. Amato got 5 mins then the boot. Kanchelskis was finished and was a very bad use of the money.
For a Dutch manager he wasn't in to youth development; the signing and improvement of McCann is the one example of what I expected him to do, which was to get some Scottish players and make them better. He definitely also did this with Ferguson but that has to be balanced against the unforgivable sale of gattuso, who everyone in Scotland could see was the perfect DM to build the whole team around.
But we then have the heartbreak of mols, who was the missing link, the top striker we needed to get to the next level in Europe, and had he remained fit, we could have been talking about a very different legacy. But overall, advocaat wasted great swathes of money and holds a large stake in our subsequent downfall IMO.