The doctrinal issues are: 

 - the role of conscience and whether it can overrule settled Church teaching (it can't);
 - whether grace can overcome all human situations, no matter how difficult (it can), or whether it is morally okay to accept sin because it's impossible to do better (it isn't) or may lead to suffering by others (it isn't);
 - whether sins such as adultery and homosexual sexual activity can continue unrepented and without any attempts to amend one's lifestyle without personal culpability (they can't); and 
 - whether access to the Eucharist for those publicly manifesting persistent serious sin will damage the faith of others through scandal (it will).
Pope Francis refuses to commit himself to clear answers. It's not dissent to call him out on this. And, in case you didn't know, no Catholic is obliged to accept novel teachings from a Pope, especially if 
they are personal opinions expressed to the media or are contained in obscure footnotes he can't recall writing.