And what about UFO: Extraterrestrials which is also not getting a great many positive remarks compared to the original XCOM? There's also UFO: Extraterrestrials 2 coming out this year (as it can be read on the website) if one didn't know.
Extraterrestials were basically a copy of the original with some extra bits.
Heck i can list them out.
1 - Additional weapon tiers (you go 2 extra tiers after plasma)
2 - A lot more armored vehicles (You even get to build "sectopods").
3 - More armors (some are specialized against a certain kind of damage but it's mainly just a side effect of more weapon tiers).
4 - a different geoscape and better airgame than what X-Com originally had.
5 - No death. Your soldiers just go "unconscious". (there are mods that fix it however)
Oh huh, I didn't know about the sectopods. I liked the personal shields though, sacrificing carrying capacity for extra protection (they stacked, though maybe they weren't in vanilla?)
A nice thing they did was, the interface had a lot of flaws and there was a lot of questionable stuff like the no-death. But this B-man guy put together a massive mod that fixed and expanded everything to an amazing degree, with individual toggles. The mod's folded into the main version now, with credits, and I assume they paid him well or even hired him.
Though sadly they had to strip out the dimensional portals which summoned OldCOM enemies
That was fun, with tech upgrades you could bring in XCOM allies instead of just enemies. Copyright, though (they even used the same sprites, it was like a retro dimension).
Frankly I think Extraterrestrials is just better than OldCOM, mostly for one reason: You get an indicator as to whether a soldier will be able to shoot various enemies from a position before you move them. XCOM was incredibly frustrating about that, and TFTD got even worse somehow.
It's waaaay unnecessarily long, though. Even if you use the convenient options to have commanders show up every mission, and change the sight ranges to realistically far. Not that bad a flaw, though, since it has like 10 tiers of weapons instead of three.
The After-X series was completely different but I really liked it too. Aftermath was exciting and well paced, Aftershock has a ton of TBS base building and is crazy long, Afterlight has you terraforming *Mars* which is nifty but is also long and a bit cartoony.
And yeah Aftermath had a lot of rocket spam towards the end. But since it's not turn based, you can often sprint away from the impact sites if you're careful.