Are all or most of the addons working with v1.7.2?

Addons made for 1.7.1 should work fine

The addon framework hasn't changed from 1.7.1 to 1.7.2
Although, there are additional functions in 1.7.2, so addons that are made for 1.7.2 may not work with 1.7.1 or 1.7.0

When you download an addon, look at the compatibility text
It will look like

Compatibility WoWRoster 1.7.2 AddOn

This means it works for 1.7.2

Compatibility WoWRoster 1.7.0 AddOn

Compatibility WoWRoster 1.7.x AddOn

This means it should work in 1.7.0, 1.7.1, or 1.7.2

Compatibility WoWRoster 1.7.1 AddOn

This means it should work in 1.7.1, or 1.7.2