No one's denying that Beast have talented vocalists; in fact, every member is a good singer, something which can't be said for SHINee. But Beast's downfall is that their vocalists all have painfully uninteresting voices, and half the time can't even use them live. During one of the 2012 Gayos, the sound system wasn't working, and every act was a mess besides SHINee (Beast included) and netizens even SAID so.
I'm not sure I understand the "tired" comment - because you don't like something, that means it's been done before? There's a logical disconnect there, comrade.
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It would be amazing if f(x) experienced a popularity spike with this comeback but it doesn't really seem likely. Sistar were riding off of the success of Alone and they had 3 excellent title tracks all released within a suitable margin of each other, whereas f(x) kind of vanished after Hot Summer, then Electric Shock (great as it was) was not Alone-success-status. Plus Luna got totally overshadowed on Immortal Song, and part of the reason anyone gives a **** about Sistar is Hyorin's performances there, so yeah.