I don't know... haven't really hated any vehicles I've owned. Two stand-out as a problem child though.
'98 Pontiac Transport Montana. 3.4 engine seized at 70,000 miles due to camshaft breaking in half at 75 mph. Long story, but dealership promised partial warranty, tried to rescind that, then gave-in when I filed a complaint with the attorney general. All kinds of other minor problems with the van, too. Eventually forced the dealer to buy back the van from us.
'11 Equinox. Great driving SUV. Bought it new. 2.4 engine got 4 timing chains, pistons/rings, water pump chain. VVT actuators, VVT solenoids, 2 exhaust manifolds, fuel pump ALL within 60,000 miles, all fixed under warranty. Water pump was leaking when we sold it. GM gave us a voucher for $2,500 off a new car due to all these problems. We bought a Subaru and gave the voucher to one of our kids when they bought a new Chevy.