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Yes the endings were not great(I say "endings" because there was the extra episode created which alse had an ending).
However as far as I was concerned the whole series was so well written that the poor endings did't spoil it.
“That which can be asserted without evidence, can be dismissed without evidence.”
UFO was a great series. It's unfortunate that Space 1999 replaced UFO season 2.
As I remember, the first episode or two of Lost in Space seemed fairly serious. Then they bought express tickets on the crazy train. I like that the galactic currency was the Squandrill.
On the anime end of things, Planetes (2003-2004) is more hard SF than space opera, and has a political backdrop that goes beyond the usual cardboard cutouts.
Legend of the Galactic Heroes (starting in 1988) is pretty interesting, though since it was an OVA series with zillions of episodes, instead of TV, they did a lot to economize on animation. The author of the books it's based on is a major history fan, and it shows. It features a war between a dictatorial empire that is reforming itself, vs a corrupt democracy. It isn't "Good vs Bad" - both sides have their good and bad points. (It's also a little David Weber-ish -- fleets of hundreds of huge ships obliterating each other.
If it qualifies, I'd have to toss in Marvel's Agents of SHIELD. SHIELD is/was a huge part of the Avengers, Captain America and Thor franchises and they credibly resurrected Agent Coulson in the TV series. It's up to season 5 and going strong. Aside from Clark Gregg (Coulson), several of the cast from the movies make appearances in the TV series. It's sort of "X-Files meets Mission: Impossible." Great show.
Sometimes the true reward for completing a task is not the money, but instead the satisfaction of a job well done. But it's usually the money.
I barely remember Hartnell, I admit. I saw some of them, but I was young.
Some of the Troughton episodes were, for their time, very good and scary - yetis roaming the London Underground system is one I remember well and it was well scary for it's time.
Pertwee was a great Doctor, too. That era, with the continuing story of the Brigadier (a descendent of whom appeared in a recent Capaldi episode IIRC), and the story The green death in particular, was a classic.
Ice warriors, Silurians, Cyber men, Daleks ... great enemies.