The phrase "a good observation" is correct and usable in written English.
It can be used to describe something that has been noticed or remarked upon that is considered to be perceptive, insightful, or accurate. Example: During the discussion, Sarah made a good observation about the impact of climate change on our local ecosystem.
Q: (Reader) Your reader last week made a good observation about what seems to pass for funny in beer ads these days.
For certain types of criminality – a violent temper, persistent theft, drug taking – prison provides a good observation ground, and an inmate can reliably be deemed to present no further threat.
Matt continues: "Brian Eno made a good observation about jamming, "Quite often, in a group, the people who aren't very expert are very useful because they are content to get a riff and stick to it.
But Calculated Risk, a finance blog, makes a good observation: On most major measures of economic health, the economy is still worse today than it was before the recession began.
Whether or not John McCain can win the GOP nomination - and Americans, regardless of political stripe, should hope for this - George Packer makes a good observation that McCain's campaign events aren't your typical manufactured press ops that the other candidates indulge in.
So this might be a good observation for space and nuclear applications.
I avoided going into this subject on the article on purpose, since it is a complex subject, but it is a very good observation.
Donald Berwick, the person appointed by Obama to be in charge of Medicare, has a column in the Wall Street Journal that makes a very good observation about how relative prices are falling for products bought and sold in the free market.
— Posted by LRK, New York, NY A very good observation!
He wrote very, very definite and strict types of dialogue and he had a very good observation of different classes of Japanese society.
