No your expectations are not unreasonable, but your results are not uncommon either.

You might consider yourself lucky though, usually when things are disorganized at the interview stage and there is poor communication there it is a sign that the company suffers from the same thing. There are of course exceptions when shit just hit the fan for them and so they struggled during a time period, but more often than not I find when companies lack good interviewing skills and basic process they themselves struggle with organization and communication.