Should we in Estonia listen to his opinions or is he basically useless?
In my opinion everyone should listen to Lipponen; he's grouchy, thin-skinned, and opinionated to a degree that makes much of what he writes or says rather entertaining. I just hope that he takes offense to Estonian criticism and fires back, because no one issues a rejoinder quite like Paavo Lipponen. So if you like colorful denunciations, he's far from useless.
Another question is whether Lipponen knows what he's talking about. He's generally pro-NATO - when there isn't an election campaign going on, that is - and very pro-EU. The latter trait was a prominent feature of his prime ministership. He has a fairly good reputation for his handling of international issues, but that was built more on supposed negotiating prowess than any special foreign policy insight.
But really, the main thing here is that what we need is a proper row between Lipponen and Estonians. If I may make a recommendation, Estonians should say something like, "Now I see the Finnish media had Lipponen's number all along." (Lipponen hates large segments of the Finnish media.) If that fails to get a rise, I'd go with "With comments like that, no wonder Finnish voters opted for Anneli Jäätteenmäki." (Lipponen really, really hates Jäätteenmäki.)