Because Millar and Davidson will miss games next season, and we need a player who can step in and provide defensive cover in the centre of the park when that happens. For all the hype about Brown he was always too indisciplined for that, he had the potential and showed against Celtic he could maybe become it, but I don't think next season will be one where we can afford to rely on players who can't cope regularly at this level.
For all the moaning we've just a 29 year old defensive midfielder, whos been a regular in this league for the past three years, for a team who'd been finishing in the top half, on a free. His "sideways" passing style is something players have success with at us before aswell.
I'm not delighted we've gone for him, but Im not willing to write him off considering the history he has in this division. Theres no doubt hes made us stronger, depth wise, in the midfield this season regardless of his performance.