Viktor was very enthusiastic.
If you recall the Triwizard Tournament, Hermione Granger ended up at the bottom of a lake when Viktor Krum chose her as his special item. This judgement, however, must be questioned.
By the time she was picked, the two of them had scarcely spoken, and did he not have anything else in his life that he enjoyed? What about his parents’ situation? What about his animal companion? He seemed a touch too enthusiastic, which was a little strange.