I long ago (like in the middle of the pilot) learned to completely ignore the "willing suspension of disbelief" flags going off in my head all of the time. Eureka is a light, character oriented series and the science (and science fiction), political maneuverings, social dynamics, and pretty much everything else is completely unrealistic. We (family) enjoy the fun situations, good acting, and interesting characters on the show and I just ignore the rest.
On almost every episode I do wonder what the show creators / writers could have done if they had kept a more serious take on the aspects I mentioned in the previous paragraph. The show still could be a comedy, with the same characters and lightheartedness, but a more realistic exploration of the issues and themes set up by a town similar to Eureka.
But that would probably take a different set of writers and script writing skills.