Your end product is only as good as the effort you put into it.
If you don’t follow up on other’s research and just import a GEDCOM into your database, you end up with a mess that no one can follow.
I knew someone who said that they just imported every GEDCOM they found online with a name they were researching hoping to make a breakthrough. Hundreds of unverified GEDCOMS imported into your live genealogy database just makes a mess that will never get resolved.
It is best when you start out to only put things into your genealogy database that you have verified, or have very good information on them. Obviously people you personally know in your family, you can put in. People your parents and so forth personally knew you can put in, but be sure to back the information up by finding them in censuses, tax records, and other records.
The better job you do, the person who inherits your research will be very glad.