Hanna, which was the BBFC's second most complained about film in 2011 (second only to Black Swan), mainly due to the strength of the violence, exacerbated by the fact that it was a young teenage girl involved in most of the fight scenes, is a 15 in Ireland. I'm glad to see the Irish are sensible, and didn't let the fact that the lead actress being their countryman, blind them to their film rating duties.
Another film that got several complaints in 2011 was Zack Snyder's Sucker Punch. For comparative purposes, check out the sheer volume of a BBFC extended info from 2011, compared to one from 2017:
Speaking of Zack Snyder movies, his Watchmen remains to this day, one of the few 18-rated comic book adaptations. It was plenty violent, but, Logan being a 15 when it felt less violent than Watchmen is somewhat of a head-scratcher.
From 2017's The White Room, a 15 for strong language and sex:
Personally, I prefer my extended information's to be a bit longer. 'A brief sex scene shows a man and a woman in bed together' tells you basically next-to-nothing!
(Can you tell I'm excited to read the BBFC's 2016 Annual Report?!)
More BBFC nerdiness here. If you would like to place a sponsored post on my blog, email me at firstname.lastname@example.org. It'll cost you £50.