I was a Spielman fan for quite a while. I think his track record of drafting was generally pretty good, and he had a number of good FA signings. His biggest failure was at QB. He was the GM for 10 drafts, and the only QB's he drafted were Touchdown Teddy and Kellen Mond. The second biggest issue (IMO) was partially the Vikings organization's fault, and that was the fact that Spielman was seemingly being evaluated on a yearly basis the last few years, which led to many "win now" moves that they are now paying for. Add in the abhorrent defensive drafting over the past numerous years, and his fate was sealed. He did a good job for the first 2/3 of his tenure as GM, but it was more than time to go. So while I don't really have "Spielman hate", he also had no business keeping his job.
Here are the defensive players drafted in his last 3 drafts in rounds 4 or higher:
2021: Chazz Surratt (3), Patrick Jones (3), Cam Bynum (4), Janarius Robinson (4)
2020: Jeff Gladney (2), Cam Dantzler (3), DJ Wonnum (4)
2019: None (!)