Comp plan shenanigans

So after 5 months interviewing and looking I finally joined this new company as a BDR and had a look at the comp plan. It says I have to achieve 50% of my number in order to start earning commission, which I found odd. Another odd thing is that I'm quoted on the number of wins and on revenue closed by my AEs, but on the rev closed I will get paid on average deal size and not the actual deal size. Has any one worked with such a comp plan before? does this sound like a good one? I mean I won't be complaining about having job, the basic is quiet good so I won't mind the shitty commission