Thing about Ronan is that, as a villain, he's kind of boring in the comics too. He works better when he's being a hero or anti-hero, but that requires establishing the Kree and establishing a whole situation that makes Ronan into a good guy (basically, it means we'd need Annihilation the Movie, which isn't going to happen.)
I know it was pointed out that, in general, Marvel doesn't focus much on villains in most of their movies. Their movies focus more heavily on the heroes and their side characters, and the villains are mostly there for conflict. Oh sure, we have exceptions like Loki who is great, but I think that was more Tom Hiddleston Hamming it up and thus owning every scene he's in, as well as Hugo Weaving's Red Skull being quite good, but generally, Marvel movies put more focus on the heroes.
It contrasts like every Batman movie ever, where they seem to like to put a lot of emphasis on the villains, and only limited emphasis on Batman (Batman Begins is the main exception here.)
In any event, yeah, Ronan is kind of bland for a villain in this, though his last scene was pretty hilarious due to just how it felt like the movie having self commentary on itself by depicting how much Ronan completely clashes with the movie's tone. Pretty much every reviewer I've seen, no matter how much they praise the movie, seem to agree that if there's a weak link in the movie, it's Ronan.