ha now this could be debated for bloody months, but i think that it is:
Tarso Marques in 1996 especially, and the worst car HAS to be the
97' Lola wots that i hear? u havent heard of it? well it failed to qualify (in the pre-qualifying session) for the 97' australian grand prix - with get this, a time that was 10 seconds SLOWER than the leader!!!
p.s i didnt read the posts above - so im really just repeating wot was said - sorry
oh yeah, the 97' lola hadnt even been in a wind tunnel!!! it was literally drawn, copied and made.