I think it’s been well handled so far for levels 1-4. Would have expected a few kobolds, orcs etc but they may be still to come - then again they may get skipped.
Under dark could have come later as could the hook horrors, bulette etc minotaurs are ok if not a little overpowered (I’m not across 5e maybe they are right).
I just hope as we progress monsters and encounters are level appropriate- loving it at the moment.
I’ll save my judgement on the story etc until the full release as we are only in ea and that’s yet to be developed significantly