I'm going to go off on a tangent here, so bear with me.
To be brutally honest, most of this list can't be fairly compared. Why? Because their media affects their lore. For instance:
Star Wars: Basically a fantasy movie with sci-fi scenery. Young knight with sword? Check. Wizard mentor? Check. Roguish companions for comedy relief? Check. Enemy fortress to infiltrate? Check. Princess to rescue? Check. Black knight to defeat... well you get the idea. Since the sci-fi elements were only a backdrop, no real effort was made to make them believable, or accurate.
Star Trek: Though the later series tried to be scientifically accurate (with actual scientific consulting), the original series didn't have that luxury, and had serious budget problems to boot. The inclusion of transporter technology was a workaround to avoid filming expensive shuttle scenes. End result, an otherwise believable sci-fi setting with a single super-science piece of technology that was so powerful that writers had to continually find excuses not to use it. I mean seriously, the ability to disintegrate, transport, and reintegrate matter would have been centuries ahead of their current level of technology, if it's possible at all. This single budget concession has become the focal point for the entire franchise.
Warhammer 40k: Here we have an enigma. On one hand, we have Games 'why have hundreds when you can have gazillions!' Workshop and their tendancy to be over the top with their franchises, yet at the same time they had to scale back the technology in order to keep the tabletop game fun. Rightly so of course; imagine what the game would be like with the kind of tech they should have: 'Ok, I won initiative. I fire my black hole generator, turning your half of the board into a quantum singularity. Good game.' This of course leads to some interesting contradictions in technology; it reminds me of pounding a square peg into a round hole. The inclusion of magic to help entice Warhammer players to buy their shiny new 40k versions only adds to the confusion. Like Star Wars, I would consider it more fantasy than sci-fi.
Stargate: Never followed it, can't comment.
Various video games: Though the tech lore tends to be quite good in these, there tends to be only enough of it to make the game. Mind you, if the game spawns sequels then enough lore may accumulate to make the franchise as detailed as any sci-fi novel. Unless of course, the game is based on an existing franchise (see above), then you're pretty much stuck with the baggage it brings.
Various anime shows: Varies widely, but tends to be unrealistic... mechs the size of the Eiffel Tower would be crushed under its own weight, regardless of what it was made of; but that's the beauty of animation, anything is possible. Again though it depends on the series in question.
So as you can see, the medium has a direct and lasting effect on the lore. While it's fairly easy to compare franchises of a similar medium (ie. movies/tv, or video games) lumping them all together becomes an exercise in frustration.
On a personal note, as someone who has read literally hundreds of sci-fi novels (sadly, I'm not exaggerating... I had no life as a kid), I find that the more advanced the setting, the less interesting it becomes. Firstly, because the further you go into the future the harder it becomes to predict it, making it harder to suspend disbelief. A good example is Star Trek. Think of all the things you could do with transporter technology, and all they came up with (for the most part) are automated food vendors. Secondly, as technology becomes more advanced, the human component becomes less and less relevant; and ultimately, its the human connection that makes these stories enjoyable, whether it be Luke or Shepherd or Kirk or the Dark Angels. My personal favorite? Cyberpunk (and yes, Battletech can fall under the cyberpunk genre).