Honestly, it seems like most of the complaints are about multicam (which is coming soon).
I don't use it, never have, and don't expect I will be anytime soon.
Here's the thing. FCP 7 didn't like any of the cameras I regularly use. FCP X does. Which means the time from when I sit down at the computer until I can be editing is IMMENSELY shorter. I know people like to be OCD about making things exactly a certain way, but I know with Aperture once I learned to stop stressing over all that and just editing my pictures, the whole process just became way more awesome, and with better results because I could focus on my project rather than dealing with the computer.
I feel like FCP X has great potential to do this as well. Is it perfect? No. Will it require getting used to some differences? Sure. But some things are worth getting used to.
And ok, saying this is just iMovie is complete childish whining. I like what Larry Jordan said about that: it's like comparing a bike and a motorcycle. They may have a similar design but they are two totally separate beasts. iMovie is a crippled little toy. Even now, in its early stages, FCP X feels like an at least competent tool for most projects (that I work on anyway). There's no way iMovie could handle things I do. Not even close. But FCP X can.
Apple said themselves they are completely rethinking the way NLEs work. If you're tied to the old ways, fine, stick with FCP 7 or switch to Avid. Nobody's stopping you. But with some growing time, I see FCP X becoming a great system. Some people are just scared of change. People hated the mouse when it first came out too, and look what happened.