I think we can include, pretty uncontroversially, these drivers as greats:
Fangio, Clark, Stewart, Lauda, Piquet, Prost, Senna, Schumacher, Alonso, Vettel and Hamilton.
So, the rest:
Farina - No, short championship.
Ascari - Yes, dominant car but fought JMF in other years.
Hawthorn - No. Poor Moss.
Brabham - Dominant cars but yes since he built one of them.
P Hill - Course not.
G Hill - Triple crown, lifted Lotus in 1968. Yes.
Hulme - Narrow no.
Rindt - Yes. Competitive throughout career.
Fittipaldi - Yes.
Hunt - Icon but not a great.
Andretti - Yes.
Scheckter - Beat Gilles, competitive elsewhere, yes.
Jones - Not quite.
K Rosberg - Lucky... no.
Mansell - Yes, for all the guts and near-misses.
D Hill - No, didn't look great away from Williams.
Villeneuve - No, nearly mugged at Williams.
Hakkinen - Nearly threw it away in 1999. Narrow no.
Raikkonen - No, beat by Massa!
Button - Yes, because he's close enough to both Hamilton and Alonso.