I get that Mothership Zeta was a little to goofy, but I like Aliens.
That's why I LIKED MZ. It was silly. And fun.
And 1950's sci fi silliness.
Aside from the captives it didn't really strike me as 1950s silliness. 1950s silliness would have been something other than greys for one thing. We'd be looking at something more like Twilight Zone aliens or dudes in rubber masks. Greys are some X Files 1990s stuff.
The Day The Earth Stood Still
http://www.imdb.com/media/rm4044602112/tt0043456
Forbidden Planet
http://www.mynewmovies.net/images/2011/06/1950s-sci-fi-movies-8.jpg
It Came From Outer Space
https://timeentertainment.files.wordpress.com/2011/08/04_1950ssci-fimovies-read-more-http-www-time-com-time-specials-packages-article-0288042068772_2068771_206875700-html-ixzz1szg8wvhv.jpg?w=480&h=320&crop=1
Several
http://silverscreensaucers.blogspot.com/2013/09/hollywoods-aliens-visual-history-part.html
Twilight Zone Stuff
Just type in Twilight Zone Aliens into Google, it's not hard
Mothership Zeta
http://fallout.wikia.com/wiki/Alien_(Fallout_3)
I don't feel there's anything wrong with some zaniness in Fallout - that's kind of the point, I think. There's a couple of reasons I think I'd prefer that if aliens do make an appearance, it be kind of a minor one-off event at most.
To me, there was something intriguingly mysterious about the Wasteland in the old Fallout games. Going out was almost like going on a walkabout or a spirit journey - reality was kind of bent, strange things happen out there. It was like exploring one of those old maps crawling with sea monsters and demons. You had your small pockets of civilization and then everything else was this nebulous Wasteland where anything could happen. Aliens were just one thing you might happen by (actually, I never got that random encounter until my third or fourth run through the game.)
I like having a little bit of mystery in this setting. But the more you expose an element in the narrative, the more you have to explain it; the more clues you have to lay out and unravel that mystery. And once that's all used up, you have a solved mystery, and where's the fun in that? In Fallout 1 and 2 aliens were something you might come across - there was no explanation beyond what you decided to piece together, and the rest was shrouded in mystery. In Vanilla Fallout 3 I thought it was pretty neat happening upon a crashed spaceship in full 3D, as a nod to the previous games. That was pretty neat.
Mothership Zeta I don't have a problem with - that's the beauty of optional DLC, after all - is that it lets you customize your own experience (the whole point of an open-world RPG like this, I think, is that each experience can be unique and individual - which is why I dislike attempts to nail things down as "canon.") But I feel like Bethesda then pretty much used up that trick - aliens are no longer a mystery, and any more involvement they have in the game is just going to continue to push the boundaries, I would worry.
I think of it as the "X-Files Dilemma." The first handful of seasons I really liked. Every week it was a different case to solve, and occasionally they'd progress in the main narrative and start discovering the big conspiracy. But eventually they'd pieced together all the clues, it became less about proving the existence of aliens and investigation, and more about just progressing the plot. Instead of finding evidence of aliens, it became each season finding a newer and more outlandish alien. As the seasons progressed they basically had to just keep upping the ante. I just kind of lost interest after awhile - it wasn't a sci-fi detective show anymore, they were basically just playing secret agent by the end.
That's sort of my feelings on aliens in Fallout at this point. Bethesda already used that trick - eventually all the mystery will be gone from their existence and it'll be just another enemy type that you have to include in any Fallout game.
For a less goofy reply than my above statement... although I like the aliens, it seems to me that Mothership Zeta ended their story. Their presence in the solar system is over. Occasional bits and pieces of tech should probably be all we see now, even if they're accepted as canon.
You can't say the same about PL.
Also, the DLCs you mentioned, with the exception of OA, were all story driven, while MZ is just a dungeon.
Why wouldn't they be? I think the aliens are gonna play a more vivid role in Fallout 4.
As long as they keep it a small thing, like the wild wasteland encounter in FONV, it's ok. Anything bigger would be annoying imo.
I actually liked Mothership Zeta and the aliens
As long as they aren't made into a major plot point like Mothership Zeta, I'll be fine with it.
Maybe they'll appear with a "Wild Wasteland" style perk.