Polkadot is a great Defi project in my opinion, and one that has the potential to replicate in the Defi space the same type of influence that ethereum has in the smart contracts space.
Thr Polkadot blockchain is like a robust network that allows the integration and combination of different Defi platforms such that real life-like financial services can be gotten through the blockchain.
This makes it very valuable in my opinion and its tokens price relatively very much undervalued