Is Napoleon really a good opening for begginers?

There are two "napoleon attacks". The one you posted is complete crap. Absolutely no point to that line whatsoever, no reason to ever recommend it to anyone.

Infact... if my greatest enemy had bet 20,000 dollars on winning a chess game, and I had the opportunity to influence his opening choice via slipping him a secret note fake-signed by a grandmaster advising him which opening to play... even if I was in a position to bet on the other player... I still would not recommend that version of the napoleon attack, because it is an abomination to chess itself and should never be recommended to anyone, under any circumstances. It defames the game of chess. I would just recommend the scotch.

This Napoleon attack is great though -

The Napoleaon attack is bad. Mayby not as utterly, horribly and totally bad as ibrust suggests, but bad anyway.

It achieves nothing, it is easier to counter then similar 2. Qh5 and it simply hands black an adventage. However, aside from that after the move there is just a game of chess. At low level anything can happen, but that's because black won't know how to build on the adventage.

No reason to recommend that to anyone.