
LOVE
Any model design which is simple, thus enabling one part to be removed independently of others. Prime examples of this would generally be older racing 2WD buggies. They naturally have less components than 4WD, but are sometimes made in key stages which are independent of others.
HATE
The over complexity of many (usually 4WD) buggies. If you want to remove one item you end up taking half the car apart to get to it. Over an hour and one hundred screws later you finally get there. But it should have been a five minute job at most. Annoying examples are along the lines of most 1/8 buggies, or a Kyosho Optima Mid in 1/10 scale (but there are others of course). Really lovely cars when made, but a real pain to work on! An example - you wish to replace a diff, so you have to: remove wheels, shocks, suspension tower, front brace, upper deck, chassis, diff housing, belts, swap diff, most of the car is a pile of parts, now reverse previous stages. A good example - Yokomo YZ10 is vastly better in this respect!