Do I miss something?

I got these recently, still haven't installed them, I know the third game has a stupid ending even with the extended cut, so I am wondering, what I am in for? can I just ignore ME3 since I don't plan to use Origin? (I have enough with one DRM platform)

Also, do I get to play as femshep since the beginning?

Disappointment. I wish I'd refunded mine.

And yes, you can play as female shepard in all three games.

Play 1, pretend there's no sequels and be happy.

Do I get to fuck alien chicks as femshep in both?

This. After sticking with the series over its 5 year or so run, your choices don't matter in the least by the end. Certain things that don't even make sense happen in the third game because of lazy development and they couldn't deliver on their promises. EA fucking ruined BioWare; right after this series was getting off to an interesting start.

you should just an hero right now.

I think femshep can only fuck the blue chick, but I could be wrong.

Think of a great, exploration based, sci-fi computer game with deep, meaningful rpg mechanics and then pretend you played that series instead of Mass Effect. Save yourself the disappointment.

Pic Related

Oh and it's pretty much ripped heavily from Star Control I and II.

Femshep only has access to worst girl.