Morning Glories: Weeds or Great Garden Vines?

I love Morning Glories.  I will search out and buy as many colors of Morning Glories as I can find.  They usually start to bloom in late summer, and add color when many other flowers have long since stopped blooming.  I throw them in my containers to add late summer/early fall color.

Morning Glory 'Grandpa Ott' blooming already this week. This one reseeded itself from last year.

Some of the morning glories will reseed themselves, such as the Grandpa Ott pictured above.  They don't reseed like crazy, instead it's usually just one or two plants in my zone 5 garden.

My aunt and uncle were just here visiting from Washington state, and when she saw my morning glory vines growing from my pots she called them weeds (in a very nice way).  I have been to Washington many times, and have seen the wild morning glory growing everywhere choking out other plants.

So what's your opinion?  Are Morning Glories weeds or great garden vines?  I found a great link that on this topic: http://www.gardensalive.com/article.asp?ai=1131