Clearly Flynn 'misled' Trump and others and his resignation is warranted.
However, readers of this thread need to keep in mind:

  -Flynn's errors have as yet not amounted to any breach of any law
  -Flynn's conversation with the Russian Ambassador was monitored and recorded by Sally Yates, the former Acting A.G. who was an Obama loyalist and who was fired by Trump for counselling a judicial insurrection against the President's EO on pausing immigration.

It would seem then that there are far more serious issues at stake, such as whether in fact elements of government, including within the intelligence community, actively conspiring to undermine the duly elected President and his agenda.  

However much you dislike Trump, this is very, very worrisome for any democracy, let alone the U.S.