So, without further ado, in no particular order:
1) Over-describing characters is a bad thing all at once. a slow buildup where the reader learns more and more about the character is much better than reciting her measurements and calling it character development...
2) Uneven pacing can be a problem when the writer describes the situation so meticulously and then suddenly a robot or person is on the floor, dead, or one of the androids malfunctions, and that's supposed to be the, err, "climax" of the story. It's like a scale...put too much on one side getting ready to get to the turning point, and if there's nothing on the other side, it's a lopsided story.
3) Mary Sue/Marty Stew Syndrome: inserting an ultimate version of you into a story where you're so special and things only seem to happen to you and you get angst but also satisfaction and on and on..it's unrealistic and take the reader out of the story.
4) Balance between action and story - I mentioned most of this above.. If you're going for an actual stand-alone story, tender moments are a nice break in the action before you and your fembot go off to battle.
5) Too much sex (except in cases where that's all you're going for) - this one speaks for itself. If it's a great story and then it turns out that most of it is just sex, sex, and MORE sex, there's no story anymore, just smut. If that's what you were going for, that's great! But if you're not, I'd say make sex like an exclamation point. When people want to make a point or say something memorable, that's when the exclamation mark comes out. In your story, sex is like the exclamation point; more suspense leading up to it can be well done, too.
6) Characters acting out of character - stay true to your characters, and find out what motivates them, whether it's a program in a mindless droid or a truck driver out of Chicago who doesn't like his job or whatever, each would behave in a certain way, and if they don't, make sure you can explain in the story why.
7) Make them different enough so people can tell them apart - Simple reminder to keep your characters as individuals, unless you're visiting a place or seeing a whole bunch of robots that are the same, then it's obviously different.

9) Give your character a reason for being: why are they there? Are they newly sentient robots trying to understand where they came from, or a big menacing guy out to get as much robot sex he can, or a scientist discovering something he's waited his whole life for. If they just suddenly appear, and especially if then they suddenly disappear, it doesn't work unless he disappeared for a reason.
10) Give them some flaws to make them realistic: we are not all perfect. No human is perfect. Obviously people will differ on perfection in robots. If they're supposed to be sentient or finding their sentience, they need some difference between them so the reader knows what's happening. Obviously, those who like perfection in androids, that they're mindless droids, or people who are more into transformation, this may not apply.
Well there you have it.. I don't know if I got every part right, but I hope it helps all of our aspiring writers on this board!