I've deleted my original and rather scathing review which was caused by the release of the series with wildly out-of-order episodes. This error has now been corrected and following an email from Amazon, I was able to request and then receive replacements for discs 2, 3 and 4. The series now makes a LOT more sense and various threads now link and recur in a coherent way.
Some of the episodes still jar as being a bit too silly (the hero who wears a purple 'superhero' suit is one example), but by and large, the series has some excellent storylines. Very effective use is made of the H.G.Wells thread and the episode inside the re-awakened Warehouse 2 is very good - albeit a bit too similar visually to elements of 'Galaxy Quest' (big whizzy things in a corridor) and 'National Treasure' (burning oil trails illuminating the warehouse interior).
Nevertheless, what was a 2-star review now becomes a 4-star review. But maybe next time, the SyFy people will be more careful when releasing series to DVD.
One last tip - don't even bother with the 'Eureka' crossover episode. It's drivel. Why wasn't that space used for the Christmas special?