[Major Tom]

You didn't actually get to see everyone in the TOS episode that was supposed to be from Khan's sleeper ship. So there 'might' have been some younger siblings or child prodegies (these genetically enhanced leaders probably wanted genetically enhanced successors). Yet this might also be 'filler'. Checkov was not a part of the Star Trek cast when Khan was originally in TOS, but for some reason Checkov and Khan knew eachother in Star Trek II.

These plot holes are technically small (you would really have to know your stuff to see the holes, as I had no problem with the movie until someone told me about all of the little details). When you compare it to the plot holes done recently, Star Trek II's are more explainable, as they only affected certain small bits of plot and diologue. The fact that some of Khan's followers were young, and Checkov knew Khan when he should not have does not really detract from Star Trek, as they are just minor points.

What gets me about DS9 is that it does not appear to look planned. I kept on seeing changes done to improve Ratings (adding Worf when TNG ended), having Sisco shave his head and get that gotee to look tougher. To me, the big Dominion war looks like they could not think of a way to improve Ratings, and decided to go the war route. The first encounter with the Dominion was good, when that Galaxy Class ship was destroyed. However, soon after they got the Defiant (like the Whitestar from B5) and suddenly there were hundreds of starfleet, klingon and romulan spaceships blowing up hundreds of dominion and cardassian ships. Star Trek was not about hundreds of ships fighting hundreds more, battles were usually between, at most, a few dozen. The more battles, and the more ships involved, the less personal the fighting got. Previously, to defeat an enemy ship took cunning, time and effort (it was a big deal to come up against a single Romulan warbird). DS9 made destroying any ship common place, and really got boring as all of their battles appeared to be EXACTLY the same.

B5's battles were interesting, as they dealt with different opponents, different tactics and such. The big battle between the Shadow, Vorlons and the Alliance was reminiscent of a typical DS9 batte, but this was B5's high-point in the war, and of course it must be big. Most other B5 battles were between handfulls of ships, where killing just one Shadow vessel was an amazing feat.

DS9 and VOY just ruined my impressions on what Star Trek was. Star Trek had wars (all the way back to TOS), but these were not the all consuming plot driver that DS9 got into and VOY jumped into as well. Also, half of their plots were the very outdated 'it was just a dream and never happened' with all of the alternate-dimension (they stole this from TOS and beat it until it was as boring as the borg) and time travelling that was commonplace.