1. They use Maine lobster
The most important thing in any roll: you've got the right lobster. When one imagines a lobster they usually think of the American lobster, Homarus americanus, rather than the clawless rock lobsters found in tropical waters. And when one thinks of what state is famous for lobsters, one thinks of Maine. Lobsters from there are the best in the world due to the cold, non-polluted waters and sustainable management of the fishery. Most people would prefer an Idaho potato over, say, an Alabama potato. Right?
2. They don't use tail meat
Tail meat? Are you a barbarian? The delicate flesh of the knuckle and claw are where the best flavor and texture are. While the tail is nice, it's either chopped and mixed up into a lobster salad or just too thick and unwieldy to belong in a proper roll.
3. They're not "dragged through the garden"
Meaning Main-style rolls aren't covered in celery, parsley, spinach, or whatever weird vegetable shenanigans New England-style lobster rolls try to pull. No, Maine-style ensures the lobster shines with each bite, not an herb garden.