Ship size and speed are both relevant in the game. Just not in combat.
Well, it's in combat that it should be relevant. Size isn't really relevant anywhere, since the values produced are so bizarre that I wonder how they did come to be. Speed is important for movement, and we know how weill it is implemented in the game.
Hitting a barn a few feet away is pretty easy with a rock, but impossible from 2 kilometers away, unless of course you had a 120 mm cannon, but move the barn another 50 kilometers and your cannon is useless, and that barn isn't even moving!
We're not talking about throwing rocks at ships, are we? It is also not about range, since not even that is represented in the game. Evasive maneuvers and range are hardly related.
Also, you have the chance to roll a 0 on an attack, so in my opinion, tech, size, speed, maneuverability, crew experience and distance is considered in that way.
Not really. What's the average on an attack roll? Does that take into account any of those factors you mentioned? The average doesn't change when those conditions change.
What makes you think they are slow? Dreadnoughts in my games are much faster than fighters. I would assume that they are not as maneuverable however and that would be their downfall, not speed.
The game doesn't really try to represent speed in an accurate way. They had to nerf engines and all...
As for maneuverability, I think that was the whole point. Combat speed if you will.
A billion dollar battleship can be taken out by an F-14 Tomcat costing around 15 million dollars, using a missile that costs in the neighborhood of $200,000. Using your reasoning, this should not be the case.
Well, except for interceptors, you can say the same thing about carriers or any other vessel class. Carriers are still around though, as are cruisers. Battleships were made obsolete basically because they're not really effective anymore, not in modern warfare. Smaller, cheaper, faster and more maneuverable units with carrier support have made them obsolete.
The battleship is larger, has a higher attack and defense yet the Tomcat is superior due to missile technology and speed/maneuverability.
With some missile defense, the F-14 would be made useless though.
Back to the topic, the fluctuation of the odds is exagerated. As for being a feature the devs didn't seem to care much about, starbases have their problems too; even space battles aren't all that detailed either.