To me it seems there are two possibilities here:
EITHER the OP has a genuine cause for complaint against the university because:
there are no clearly published marking criteria
there is no clear course outline & guide to resources which would enable students
the university have deliberately made a lecturer redundant mid-semester instead of waiting for the end of the module
OR:
there are guidelines for marking but the OP hasn't bothered to look them up
there is a module handbook but the OP hasn't bothered to read it
the lecturer has chosen to leave mid-term (for whatever reason) and the university (for whatever reason) are not responsible
(as to the latter of those three I would say likely scenario= lecturer is made redundant to save money, gets other job & has to leave in time to start other job)
I do not agree that one should meekly accept that lectures are a waste of time. Have just read the student evaluations for a colleague's course and the students are unanimous in their praise of the clarity and enthusiasm of her lectures. Quite right too.
But cordelia is right in her expose of what university money goes on. We are also constantly told that the first impression is vital on Visiting Day- which basically means new colour-coordinated carpets get priority above. Because if students (or their parents) choose somewhere else that looked "nicer", then we can't do the job at all.
As for the highly paid VCs, we haven't asked for those: they are wished on us by a Council which is not made up of lecturers but of other senior management and outside business leaders: this is all part of the government-imposed idea that universities should be run like businesses. The only bit that is clearly un-businesslike is the fact that VCs surprisingly often sit on their own remuneration committees. I can assure you that I take absolutely no pleasure in the thought that my VC earns 23 times as much as I do.
I still try to deliver the very best and most engaging lectures I can. But I also try to remind students that their experience does depend on them making the most of the resources provided- and that involves reading the Student Handbook and the Module Handbook, for every new module.
So OP, I'm not sure what you ought to do about complaining- because I haven't seen the resources available. But what you absolutely need to do now, for your own sake, to get your money's worth, is to try to see it as a challenge and do your utmost to revise effectively over the Christmas period. Ultimately, it's your future and you can't risk that over some less-than-perfect lecturer who may well be dead before you reach retirement. After Christmas you will have a clearer idea of whether the job was doable with the resources available or not.