What do I think of this?

Turgid. Please refer to Russia's review for Marcin's singing style, a sound also not unlike a pissed up Longthorne. It's not long before his vocal technique brings one of his own backing singers to her knees, and I'm only surprised she doesn't commit seppuku on the spot. The Royal Observatory at Greenwich have recently confirmed that "Legenda" is the longest 2mins 30secs you can experience in either hemisphere, and that it's chances will go straight down the plughole rather than swirling either clockwise or anti-clockwise. A couple of traditionally dressed ladies twirl a curtain sample book around him in a manner which is just about as welcome as Frankie Boyle in Dictionary Corner. Even the mole on his face tries to head for the exit when he starts wailing uncontrollably.

I cannot say enough about "Legenda" (all negative), and it surely has to finish last in Semi number 1.

Biography

Marcin Mrozinski is a 24-year-old singer and actor. He also writes and composes his own songs. He was 8-year-old when debuting in TV kindershow 5-10-15 and later took part in most of children's song contests in Poland always achieving top scores. Since then, Marcin has a lot of success as actor and singer. He hosts a Cartoon Network production Staraoke recorded in MTV's studio in London as well and currently he is working on his first solo album.
Marcin is an actor currently starring in four theatre productions in Poland, The Phantom of the Opera, Boyband, Piosenka Jest Dobra Na Wszystko and Notre Dame l'Histoire concert based on musical Notre Dame de Paris.
His overwhelming victory in the Polish national selection makes him the 15th representative of his country. Marcin's fans believe the song will be a legendary contribution to the contest.
The composer of the song, Marcin Nierubiec is a songwriter and composer. He has cooperated with many top Polish artists like Doda, Maryla Rodowicz, Krzysztof Krawczyk, Michal Bajor, Michal Rudas and others.
Marcin Nierubiec also composes his music for theater plays, TV programmes and children. His sacral Hymn to Saint Stanislaw Kostka was performed on the occasion of celebrations devoted to late Pope John Paul II.