The dialogue in ATOM was too much. Everyone goes on and on, and the input from the player is minimal. You're just working your way through a checklist, often the same checklist, over and over. It's like if you when you played Morrowind you asked every NPC about every keyword. There's also a uniformity to how everyone talks that I'm not a fan of. Some of it is funny, and it's certainly colorful and vivid writing, so it's not all bad. But my eyes glazed over within minutes each time I tried to play it.
As I understand it, some of the dialogue gets lost in translation. There are supposedly a lot of jokes and cultural references that non-Russian gamers won't get.
I'm not saying the writing would be great if we were Russian, but it probably does factor in at least to some degree.
As far as being verbose, yeah, I agree it can get old pretty fast when so many NPCs have that much dialogue.