He missed an open goal in one game, screwed it wide.
And how do you expect people to react when people who don't rate Parker are so hyperbole against him? And most of his detractors are people who either love an alternative that isn't being picked or didn't want him at the club in the first place and refuse to change their mind no matter what he does.
You yourself said he'd never score a goal like Sandro's, for example.
http://www.youtube.com/watch?v=jXmFX7E1c-4 (3 minutes in, and worth watching anyway for the chance to see Rose's goal again!). Sandro's goal was superb, but it was a half volley so the power was easy to obtain and it had to be to make sure he could beat the keeper even if the ball was at a height to be saved. The goal Parker scores here is harder to execute as he has to generate power himself which is tough to do hence why most shots are often ballooned.
Neither goal proves a thing though, as there isn't a professional player in the English game who isn't capable of scoring 30 yard screamers under the right circumstances. It's how often they try it, and their ratio of success that defines how good they actually are at it.
Anyway my final thoughts on it are mulling over what you typed "Parker would never have, and will probably never will score a goal like Sandro's against Chelsea, but I'll bet that Sandro will score plenty more like it.". All I can respond to that is 22 seconds into the clip.....
http://www.youtube.com/watch?v=A_UT9KBYfZ0&feature=fvwrel