Definitely the likes of Alesi, de Angelis Brundle, Nannini, Gilles, Panis, Trulli etc as others of mentioned.
I’d also add Fisichella – epic in slow cars, average in quick ones
Berger – Unlucky to come up against the likes of Prost and Senna, terrific driver
Verstappen – Thrown in at the deep end and went backwards, but epic in the rain and a great racer
There are so many drivers you could add to this list…