I've known for a long time that eating cold pizza was a thing. But I've only had takeaway pizza once, at university, and it wasn't that exciting, so the opportunity hasn't really come up.
So I purposely did it: got a takeaway pizza that was two meals worth, ate half and then put the other half in the fridge.
It was a vegan pizza, so maybe it was different, but I really liked it. It tasted the same cold as it did hot, just cold. I don't know if the opportunity will come up again, but if I did, I would eat cold pizza again.
I'll give it 8/10 - if only because it takes longer and costs more than just bunging a frozen pizza in the oven.