There's nothing wrong with speculation, whether it's positive or negative. One could assume the game will be "fun" just as they could assume it'll be "stupid". Of course, waiting to play it is the best way to cast a "judgement" on it, but it's more conducive to discussion in the mean time to weigh the pros or cons.
Of course, it's also entirely just to want to customize the experience yet, as that's also one of the core components of the Halo experience. Really, this is nothing out of the ordinary.