[radu_floricica]

I know very well how you feel. I cannot give concrete advice, since I'm in a different part of the world and the context doesn't apply, but it sounds all too familiar.

What I can say is that a job and a PhD are completely different paths. Both have advantages and satisfactions, but they require different things. If you want a job, grades most likely don't matter. This I can safely say about any free market economy, especially in this field. But for a PhD... at least where I'm from, what matters most is having your personal professor guiding you. Whatever he says goes.