Some of the drawbacks of glass tables are:
Espouses hate them because they can see fingerprints all over.
As they are transparent, they also hate to see the dust that acummulates on the frame, and they hate having to clean it as well.
In summer they are not pleasant to lay your bare arms on them because they feel cold, imagine it in winter.
One can't play with the feet with the woman sitting in front without being noticed.
The idea behind glass tables is basically make rooms look bigger or not cluttered.
Don't get me wrong, I like them but on specific places and specific designs as well.