If you even have one friend who enjoys anime, odds are you've heard of Attack on Titan. As a fan myself it seemed right up my alley, and my weekly anime club ended up giving it a shot last year.
Sadly, I wasn't impressed. While the premise for Titan is intriguing, there's an overabundance of filler (even more than your average series) and a lack of worthwhile characters outside of a select few -- two key components that made it incredibly difficult for me to enjoy. The few and far between action sequences are great, but I only truly liked the first OVA episode (Ilse's Notebook), which is the only bit of the show that gave us anything remotely interesting lore-wise.