Summary

Good
IPSec provides numerous security services as standard protocol at the IP layer.
IPSec provides secure interoperable communication between any devices.
IPSec can protect many protocols on the IP layer.

Bad
IPSec does not concern itself with application level security.
There are too many parameters to utilize IPSec.
Some technologies are incompatible with IPSec.

Solution
We have to use another security method in conjunction with IPSec.
We need more specific guidelines on how IPSec works.
We have to consider the relationship to other components.