For starship and boat weapons, the roll is different. You need to roll 1 or 2 to hit. A pair or more of ones indicates a critical. The player receives a 1d6 per roll based on the tech level of their weapon, up to a maximum of 6d6.
In other parts of the game, there is a standard roll of 1d6 or 2d6, where the character can have pluses and minuses modify the roll. The roll is usually used to determine what of 6 or 12 things happen next not how good you are doing. The evaluation of "good" or "bad" happens as a result of reading a paragraph or two describing an event. Getting in a fight is supposed to be bad, but if you have large party of characters that idea is flipped on it's head because the player can dominate the battlefield. Getting a cool new item is supposed to be good, but if you don't have room for it, it's useless.
The D&D player in me only noticed the standard roll of 1d6 or 2d6 with modifiers and could not conceptualize why giving modifiers to weapons fire does not work. I know, I've tried. It's because those rolls are from a dice pool, a concept that is totally foreign to me.
This is a case of knowing your rule sets and having a great background in games, mechanics and theory helps a lot. I am all about D&D while I find Traveller to be entirely opaque. Traveller fascinates me because I can't figure out how the game master and players use the game mechanics to make great things happen. I've heard of people playing one Traveller campaign for decades, as I have been doing with Star Smuggler. The basic mechanics make that happen.
In D&D, my campaigns fizzle after a few weeks or months because the characters reach a point where the truly fantastic has to happen over and over each session to make the game go. The rules lose their gritty danger as the characters improve. That's baked right into D&D while Traveller has a totally different mindset where it's not likely that your character will mechanically improve at all. They get better and smarter, but everyone is still one blaster shot away from death. It's the psychological threat level that changes, not the characters abilities. It's all in the scope of the story.
This is probably the reason why I've been listening to Safco Cast so much. I am sure most listeners are looking to Jeff Koenig and Bob Loftin Traveller experiences, I am listening for their Gaming experience. It's this whole "new" world of Traveller that fascinates me not for the world itself, but the whole mechanical framework that makes the play happen. In the last episode I listened to, they spoke all about dice pools and it really sorted out some issues I had with Star Smuggler because of my personal experience with D&D. Bob and Jeff are truly enlightening, because of the way they present the Traveller rules while also looking other systems like Cepheus and make great comparisons in how things are done.
Amazing. Why don't you give them a try?