This top 10 list ranks my favorite sci-fi shows that specifically deal with space and/or aliens. I don't know how to compare these shows to other sci-fi shows that don't involve space and/or aliens. So here we go...
10. Star Trek (Voyager)
I avoided watching this show until recently... and even then I skipped most episodes that weren't centered on either the doctor or Seven of Nine (both characters seemed to be a spin-off of Data from TNG). But I did watch a few dozen episodes and enjoyed most of them. I also liked the ending. This beats out the only other candidates for #10 that I can think of (shows I've seen): Star Trek (Original) and Earth 2.
I think I will get in trouble for ranking Firefly 9th instead of top 5 (or even top 3). I know a lot of people really loved it. I liked it a lot (there's a big gap b/w 10 and 9 here). I wish it had been on for more episodes. It certainly could have climbed the list a bit if that were the case. The combination of Sci-fi and Western was creative (I also liked Dollhouse, from the same mind... though I maybe even liked Dollhouse better).
Yes, I know, this was a teen romance more than sci-fi sometimes. But I have to admit I really enjoyed this show. I thought the storyline was good and the characters likeable. It was a bit longer than Firefly, which gives it the extra spot.
I posted this list on Facebook some months back, but have sinced watched the one season of Caprica. Why was this cancelled. I really enjoyed it. I don't think the storyline could have gone more than a few seasons, but they would have been good.
6. Stargate Universe
This is where it gets really tough for me. All of the top 6 make a strong case for the #1 spot in my mind. I really feel that if Stargate Universe had continued for 5 or 6 seasons, it'd be number 1. I know I'm in the minority since most stargate fans liked this show the least, but I really enjoyed it. I wanted more.
5. Stargate Atlantis
How do you decide between these Stargate series'? I find it very difficult. I've basically ranked them, here, according to length of the show since I value quantity when quality is pretty equal. This show was a good combination of solid storyline, quality character development, and humor.
4. Stargate SG-1
Longevity is a big help here. Great show and it was on for a long time. Solid characters. They were even mildly successful and totally changing the enemy and some of the major characters to enlongate the series. Plus, this show gets the credit for making the spin-offs possible.
It was a tough call, but I am ranking Farscape beyond the Stargate shows. I very much liked this show. It wasn't that the enemies were the worst or the storylines the best, the show was just fun. The characters were so varied and fresh. I really liked the cast selection here.
2. Star Trek (Next Generation)
If I'm watching this today for the first time, it gets nowhere near #2, but I have to keep in mind that if it weren't for Star Trek TNG, I might not even have bothered watching the other 9 (including the original Star Trek, which I watched after watching TNG). Growing up, this was one of my favorite shows and, though it's hard to look at compared to today's sci-fi, it's still great.
1. Battlestar Galactica (New)
The original Battlestar Galactica was pretty good for its time, but I would have to say that the new Battlestar Galactica is, by a very slim margin over most of the shows on this list, my favorite Sci-Fi show of all time. Lots of episodes, awesome character development, fresh episodes, solid special effects, plenty of twists and turns, etc. Granted, I didn't always like the storyline, but that simply shows that I cared. The ending was so-so in my opinion, but overall, this show tops the chart.
Feel free to argue or tell me what I NEED to see that fits this genre