Plot wise - this was repetitive and if you're not a fan of constant descriptions (all the holidays are just described) then maybe don't pick up this book
Were the main characters problematic? Yes! 
But were they justified? Eh, sometimes - honestly they just needed to admit their feelings 
But were their pasts preventing them from doing this? Yes absolutely! 
I loved how we see them tak accountability for their actions in the end by finally going for

therapy

But honestly I loved this book purely because the characters spoke to me - Poppy with her wanderlust trying to escape her past and Alex the oldest sibling who feels like he can't be happy unless everyone else around him is happy
Do they match in personality - Nope, but do they find happiness with and in one another - Yes! And that's what made this book special to me
Sometimes you find someone who makes absolutely no sense to be with, but they are your person!