The reviews are in

Don Martin:

It takes considerable effort to become a complete embarrassment.

Congratulations Senator Mike Duffy, you've finally done it.

With his wild rant on a CBC national politics show this week, the television icon has accomplished the difficult feat of offending all those in his parliamentary orbit -- his former journalistic occupation, the Conservative party, senators, MPs and even the prime minister who appointed him.
...
It's not easy for me to write this because Mike Duffy was a personal friend until I derided his appointment to the Senate, but Thursday's antics have cost him any lingering credibility.

Many senators are decent types trying to make intelligent and constructive contributions to public policy.

But Mike Duffy's only value has become that of poster boy for why the Senate needs, at very least, major reform if not outright abolition.