Depending in your system setup MySql can easily handle over 50.000 inserts per sec.
For tests on a current system i am working on we got to over 200k inserts per sec. with 100 concurrent connections on 10 tables (just some values).
Not saying that this is the best choice since other systems like couch could make replication/backups/scaling easier but dismissing mysql solely on the fact that it can't handle so minor amounts of data it a little to harsh.
I guess there are better solutions (read: cheaper, easier to administer) solutions out there.