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Patrick Breyer and Pirate Party lose EU Parliament seats
(stackdiary.com)
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There are voting systems that completely prevent the need for tactical voting (e.g. instant-runoff voting, aka alternative vote) but if the system still trends towards having two main parties then not much has really changed.
A bigger issue is that a single candidate/party is not very good at representing an area in comparison to having more (3, 5, ideally more). If people vote 80% A and 20% B and A gets the single candidate then 20% are misrepresented. With 5 candidates then that could be split 4 to A and 1 to B, a perfect representation.