Note how I said interesting, not jerk. Making the rival a jerk is just the easy shortcut to making the rival interesting. I'd be okay with a nice rival as well, but GF needs to give us an actual reason to like those rivals instead of just telling us from the get-go that we are friends in a cutscene.
For the record, I'm not considering N a rival in this topic, but even if you do, the topic still holds, since this gen gave us 4 uninteresting rivals.
"That does not excuse the things we have done. It is merely a motive, not a justification" --Kratos Aurion
Well, I liked the serious rival and carefree rival scheme they had in Gen. 5. I honestly did get tired of the "rival treats you like crap" thing, even if I did like Silver. Maybe just more like that, but maybe with more personality. Also, I kinda feel like a bully for beating up Serena's team every day, even if she's giving me a life lesson every time.