Well, the statement didn't pass with a really narrow margin - the chairperson decided. One MEP less on the right, and the statement would have went through.
While Parliament couldn't have forced Berlusconi to step down nor sell his newspapers OR ask him to stop using them as political weapon, it would have been a statement on what the other countries think of Italy's politics - which also affect the other states. Berlusconi has, among other things, tried to block all EU communication from minister councils and commission without the approval of all member states - effectively making it even harder for citizens to know and affect upon up an coming legislation and directives.
If the statement had passed, Berlusconi would have had much harder time trying proceeding on this venue, but.. you know..
"As long as it wasn't Berlusconi.."
If you didn't vote at all, you effectively gave your right to decide to others - who voted Berlusconi (supposing you're Italian). If you aren't Italian, there are quite many bad people you could vote. Remember, the previous EU Parliament was against 138, while the new one much less so. Did you vote? Who did you vote? EU is behind many things.. both good and bad. Most of the "bad things" spring from the Council of Ministers, who are fervently pushing for the good of their own states. Strong parliament is generally a good thing (while examples to the contrary could perhaps be found), and balances things out.