because you cant play?
srsly, you're not even trying there, you're just playing random notes from some scale and your guitar is out of tune or/and badly intonated
Well that just kinda fails, to be a proper metal musician you have to be able to not only play fast but to play with raw emotion and the excitement that you had when you first picked up and electric guitar, speed isnt everything, look at the likes of Steve Vai, sure he plays fast and is totally awesome, but listen to the emotion he puts into his songs, for example 'For the love of God' you cant get much better than that