Dante can die too. Dante can't summon a meteor that can destroy the whole world. Dante don't wear a 3 meter long katana.
Dante have never felt the power of any real damage. Counting stuff like meteor, ultima, holy, Supernova and Heartless Angel.
Okay Darkslayer, Vergil isn't as fast as Wesker. Vergil may teleport but he ain't that fast so it looks like he is teleporting.
If everyone that have endured a scientific experiment is a zombie to you then there are alot of zombies. I thought zombies where mindless creatures, if they do have a mind = no zombie.
Dante is the half-breed, just because he is son of a legend doesn't mean he is just as strong as he is.
Wesker is extremely fast, if Dante uses quicksilver he is lucky if his speed is on par with Weskers.
If I do remember correctly, Wesker was born as an experiment from the start. (need your help to remember SpardaTM)