Superman is boring to me. Not enough human connection to him, plus his abilities have no limits. I just have never been able to enjoy a story with him in it (at least, him as the main character). I have not read many but the ones I have read have done nothing for me so I steered clear.

Green Lantern also bores me. Ditto for Aquaman. Over at Marvel, I would have to say that the Hulk is the most boring for me. Hulk smash. Again, I am more about him if he is making a cameo or appears for part of a story.

I will agree that Human Torch is a pretty boring character. Never really changes. I also find war comics very hit and miss. I like offbeat tales, like Weird War and anything with the Haunted Tank or Unknown Soldier sits well with me. But Sgt. Fury and Sgt. Rock can get a little boring, story wise. Artwork is always pretty stellar though.

Perhaps I will.

Fun fact: I haven't read the prose sections of Watchmen.

Have you tried Charley's War? It's many things, but boring is not one of them.

Am I going to be the first person to nominate the Punisher?

Part of the appeal of superheroes is that they fight the bad guys using means unavailable to ordinary people -- super powers, hi-tech gadgets, advanced suits of armor, magic trinkets, etc. etc.

Punisher fights crime with.... guns. Lots of guns.

Which is why I adore him.

*bang bang*

I like the Punisher a lot better as a foil than as a protagonist. 

If he is the protagonist I think it takes an artist (not writer) who is a master visual storyteller to keep him from being boring because the type of fast paced action associated with that genre of fiction is very difficult to capture and convey in static art. There is a lag time between gun fired and victim hit when depicted in panels that kills the immediacy and impact of that type of gunplay action (which might be why some find war comics dull too except those by masters of that form like Kubert), making the story seem slow and dull to me. 

Also a lot of what makes the story interesting is the conflict that drives it, the differences between the heroes and villains, and as I have stated before I don't see much of those differences between Castle and his antagonists in a lot of the stories I have read, so I don't find the conflict driving the story to be very captivating either. So less skilled action sequences and uninteresting conflict leads me to find most of the Punisher led stories dull. However that nature of Castle contrasted with more typical super-heroes makes the conflict driving stories where he is the foil for those characters much more interesting to me. 

And for me there are few heroes that are inherently boring, since it is the conflict that drives the story that makes them interesting and that comes down to the storytellers not the characters. That said, there are more villains I find boring than heroes because they don't really provide interesting conflicts for the heroes they face because they don't engage the hero on multiple levels (one note punching bag villains take notice here), and heroes with boring rogues galleries are more likely to have what I consider boring stories told with them because of the lack of interest in the conflict in the story. 

That's why I find villains that couple an inner conflict or turmoil with the conflict they provide to the protagonists to be more interesting (and why I don't find Thanos to be boring but Doomsday to be as boring as watching paint dry). 

-M