I wouldn't call it weakest, of course the playercount (and probably the income) isn't as high as iEra/iClassic's, but 'weak' is the wrong choice of words. 
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Weak is the perfect term for it. iZone didn't have any sort of direction until Stefan/Tashkin or whomever thought of the idea of "Let's rip off iEra and just put a sci fi twist in it".