For me, I think it depends on the story, but generally, I like dialogue heavy series. Usually comics with lots of dialogue work for very plot driven/lots of exposition stories, and if the author is good at writing their characters, it can work for character-driven stories.
An example of a comic I can think of that does dialogue heavy scenes well is the comic I'm The Grim Reaper. It's got a nice balance of action and story, but when the dialogue-heavy scenes come, they end up being my favorites.
But since comics are indeed a visual medium, it's important not to bog down it down with unnecessary dialogue. Show don't tell applies here too. Basically, if you can convey it through a panel without dialogue, don't add dialogue.