It's really damn small. Beamdog only added iPhone support for the Plus and because people kept demanding it. Once they added their smart tap functionality (the game tries to figure out what you really meant to tap on based on context instead of being 100 pixel accurate, which sounds like it would be terrible but is actually a fantastic feature), they decided it could be played OK on a larger phone.
So, sure you can play through it, but just expect it to be kind of microscopic. Also keep in mind, Siege of Dragonspear is not out on iOS and Android for an estimated 5-6 weeks.
As far as the controversies, yeah I disagree with the comments the writer made in that article, but making a big blow up over it is stupid. Check out the new content, then decide whether it's good, bad, or uninteresting content and move on. Options are what people are always going on about and people have new options here. Hopefully the options for everyone are good. I've found Bioware's in DA:I for straight male characters pretty terrible.