Delegated proof-of-stake is worse than Proof-of-Stake or Proof-of-Work from a decentralization perspective as the "delegators" can bribe their way to stay in power.

Some resources (they link to DPoS alternatives and discuss them):

- https://vitalik.ca/general/2016/12/29/pos_design.html

- https://vitalik.ca/general/2017/12/17/voting.html

- https://vitalik.ca/general/2018/03/28/plutocracy.html

- https://vitalik.ca/general/2019/04/03/collusion.html