His jumps were probably the best ever some years ago. (even though it's difficult to compare them to Yagudin's). Now, I prefer Hanyu and Chan's jumps, they have more speed, more difficult entries and the jumps are more in harmony with the rest of the choreography. At the PCS, he wasn't the best, he can't be compared to Lambiel or Takahashi.
Anyway, it's almost impossible to say who is the best figure skater ever, there's no criteria. Plushenko is an amazing skater, one of the best ever, but you can't say it's the best.