Coming out alongside Fallout 4 and doing timed Xbox exclusivity was always going to result in lower sales. I don't think anyone is going to be too surprised by these numbers.
I guess it will probably do OK on the other platforms when it hits them, but I can't help but imagine SE regret doing the deal with Microsoft. Unless MS paid up big big money, I imagine they have done badly from this deal.
I think it is also the case that the contractually agreed misleading information regarding the exclusivity (pretending it was a proper exclusive rather than simply stating it was a timed exclusive deal when it was first announced), and indeed having previously announced it as a multiplatform title, has done a degree of harm to this title in terms of negative association from the game buying public. Not enough to massively hamper sales, but I think it will have had some impact.
Edit: Personally I hope it does not so badly for SE that they shut down/scale back the studio, but badly enough that they give the series a rest and resurrect Legacy of Kain instead.