One of my friends told me that Trundle is broken top so I decided to try him... and well, he is OP. He pushes towers so damn fast and can easily 1v2. He is like AP TRynd back in the day, except better. Most people haven't discovered his OPness because people use him in the jungle, but just go top, build BotRK, Hydra, and MErcs, then go for health, and splitpush till no tomorrow.
I noticed Trundle's ability to split push the first time I used him in free week. He's actually pretty fun to play too. He doesn't quite play like AP Trynd since he can and does actually fight. He's also really good in teamfights. The ability to corner people against walls with his E then AA/Q combo people to death with W up is also pretty entertaining.
Really, it's been the opposite for me. Every Trundle top gets wrecked by Volibar, Darius, Jax, etc. and every jungle I've seen is very good. Point is, until I see a good trundle top, I will take it as bad.