What do you mean it's not a good opening?
For white it's great when black plays 5...Nxd5, you didn't play the best response (6.d4) Nxf7 is good but gives black a draw with correct play .
And even if your opponent dosen't play 5...Nxd5 you can get good positions as white.
Today I played at the internal competition of chessclub Het Kasteel in Wijchen. I love to play sharp games and like to play Gambits. I know this is not a good opening, but at my level (below 1600) gambits can work. The Fried Liver can work as well. And it worked.... Fritz analyzed this game as well, but why should I play dxe5? (I am white)