The Adder is EASILY the most despised car on this forum: to the point that people hate it enough to deem it overrated either by malice or from ignorantly missing the point of the thread.
A lot of people hate them, the vocal minority love it, but overrated it is not. It's a great freeroam car, even if it's reputation garners a little more negative attention. I've found them to be durable, and its breakneck speed is valuable in evading the law and unfriendly players. I guess my fondness stems from single player where it is the easiest Super to possess (since it's the only one with a reliable spawn point) and in turn I had a lot of wheel time in one (Franklin is nigh unstoppable in one.)