For me anything automotive or light truck I hate. Never messed with boats tho.
Try it sometime, makes cars fun.
Working on a boat:
1) The engine is buried down in a hole. A hole that always has moldy water in the bottom.
2) The engine is this old carbureted pile designed in 1970
3) The engine is cooled with pond water and gets run 2 hours a year.
4) Everything is slimy water/oil nasty.
5) The whole affair is up on a trailer, the sides of the boat are 6' in the air.
6) The whole affair is way out in the parking lot because it doesn't fit in the shop.
7) Did I mention the mold and mildew everywhere?