Actually, I think that having the comments on a separate page is one of the best improvements MD has made over Batoto.
Most of the comments are shit. They're unfunny "jokes," pointless arguments and spoilers. If I want to wade through that shit (or add to it), I can just click one link and wade through them to my heart's content. And if I don't, they just stay on another page, out of my way.
And honestly, I think that making it at least that little bit difficult to comment on a manga is definitely a good thing. Anybody who can't be arsed to click one link to get to a comment page almost certainly has nothing of any value to say anyway.