Ive loved some cars that others have hated, such as the Fireblade and the BK2.

Id have another BK2 if I could buy a new unbuilt one today. Oh and the RC10B3, I loved that.

Id put those 3 amongst my favourites.
Worst
Cougar 2 Team, I couldn't get it to steer.
Academy Griffin Pro, Nick from Evolution insisted on building it and it was toss
B4 FT, not sure if it was just that one as I have had others which have been great, couldn't do two laps the same.
Cat 2000 converted to EC. It was good before converting it, it had different length rear wishbones to the proper EC due to it being a converted car and it was utter crap. Bought a proper EC and it was fantastic.
Academy SB-sport. Again built by Nick, I percivered and talked myself into liking it - until I took the sticks of a borrowed XX4 and OMG, I realised just what shit I have been driving.
Yokomo MR4-BC, was ace indoors but broke too easily, felt good outdoors when driven on my own. But what felt fast to me outdoors was miles off the pace as it was just so skitty and 'unable'.