whats the deal with 28’s ?

reading through many threads on different sites seems as though people are staying away from 28 outlaws ? either go to 29.5 or 27 . I don’t get it . I want outlaws but 27s seem to be a bit small and 29.5 seem to be a bit much . I thought 28s would be perfect but all the reviews are stating otherwise…. any input on this ?
I am also interested to see outlaws on stock xt rims . Ive only found 1 picture after surfing the whole net .