Man, do you even read what you write? Even your examples contradict what you are trying to say.
High expectation? Only a fool had high expectation for Felix, he was a flop for Atletico and failed to succeed in Chelsea
We got him because he was the only player we could afford for the price.
Tell me whom we could have got for 0.5M that would have had a better input? This is the cost of a bench player in Celta Vigo FFS
For the cost, Felix is a bargain.
If you can afford better, you go for it. But if you judge a deal that was made, you do it based on cost and opportunity cost. In both cases Felix is a good deal.