Well it sounds right to some people, not so right to others. 50% bonus in the first year is out of the ordinary. Of course it happens in a hedge-fund or some "special" position. Most graduates work for large banks, at the start of the career there is a clear compensation evolution.
The income can be high however you have to prove yourself first and produce results. This is very difficult in the first year. You may have a bit too high expectations.
Stefan, 50% is not out of the ordinary in FO for a first year associate and is perhaps even a little on the low side from my experience. The vast majority of people from the UCB MFE end up in front office (at least this year), and a not insignificant proportion of those are traders or structurers.
P.S. my bonus when I was a year 1 associate was >> 50%.