A lot of science fiction B-movies were made in 70's. One of the biggest cult films featuring absolutely horribly effects and acting is Starcrash (1979). When you think that there is no way that this can get any worse, David Hasselhoff steps in!
Sunshine (2007) by Danny Boyle has a interesting and somewhat unique visual style to it. It is not such a great movie overall, but is worth seeing for art direction alone.
1. Besides my Trekkie orientation, I'm a fan of Stargate SG1 and Stargate Atlantis. Those series are well comparable to Star Trek in any way.
2. Maybe it will be a weird answer but in this case my favorite is BBC's Doctor Who. Just look at this primitive but very effective Main title sequence from 1963. which was made only by Valve tube camera and various interferences with some TV monitors. Music part created by Delia Derbyshire was made only by oscillators, noise generators and similar devices, recorded and played by four reel tape recorders (manually synchronized) and most important thing is that every tape was cutted more than 100-150 times and combined with an adhesive tape AND A RULER (!!!) to achieve the right lenght of every single tone and noise. That was pure art of picture and sound. Remember, in 1963. there was no keyboards, synthesizers and no PCs like today.
Could the Moon Nazis have some sort of "museum" / collection of their abandonned projects with which to take over the world? This "museum" could include all kind of invaders which have failed to conquer / destroy Earth in classic sci-fi films, as an homage to these films. For example the tripods from The War of the Worlds or Gort from The Day the Earth Stood Still.
I love the space-fights of battlestar galactica (the "new" one), for example Miniseries, part 1. The fight scenes are very "realistic" with zooms and rotatables and so on, very good stuff... an the spaceships (especially the vipers) got a very own way to fly and to turn over.... just take a look ;)