It is a very old university and everyone in Canada knows about it. Alongside, its the best in the province. But you can't expect it compete with other grad schools like UBC and uToronto. But it is in U15 list. Every province got a king university and the grads from their will get preference in job market apart from UBC/uToronto/McGill/etc; grads from there gets preference in all the provinces. So, if you intend to be in Saskatchewan (or provinces close to that like Manitoba/Alberta), you shouldn't have any problem.
Bottom line is, usask is not a HIGHLY reputed one but it has a good reputation overall.