It really depends, but overall, yes, I do like them. My only problems are the fact there either aren't enough options for certain things, like hair and facial hair as another poster stated above, or the fact that some of the areas you can tweak barely seem to change your characters features very much.
Now before I do get to listing ideas, I feel the need to say this: If Bioware doesn't allow us to customize our co-op characters for Mass Effect 3 in terms of facial features, and that includes our Asari, Drell, Salarians, Krogans and Turians looking just the way we like down to the face-paint, I will be a little disappointed.
As for ideas, I want to see the range of customization be a little more diverse, even cartoony. Maybe I want a character who has a nose that so closely resembles a beak, he could be mistaken for an eagle.
Even delve into body-type, since I'm not sure if any game has really delved into customizing that extensively. While that might make most guys playing as a female character be tempted to give them a bust that's like a pair of weather balloons reined in by no more than a strip of fabric, and who am I to complain, some of us would like the chance to make a slight, lanky character of either gender, as opposed to the generic model of 'perfection' most people have to play at the moment.