I guess if you've not a good singer... you can atleast try to be a good screamer... but in most cases... People that can "scream" effectively actually have nice singing voices.... in most cases, not all. I'm not into that kind of stuff either. I think bands like Shadows Fall, Killswitch Engaged, Trivium, In Flames... and so on... would do themselves a favor if they did songs with real vocalists... that kind of music would appeal such a larger spectrum of people... They're good bands but I can't stand listening to them either...