Took me 3 days to beat the game on hardest setting /w ryu(Playing a few hours a day) ,and I just did at a few mins ago at 2am while im baked and tired. Just thought I'd share. LOL... and yes the final boss is insanely overpowered.
If you live on the west cost, Cali and want to get some games in add me, ADDlCTl0N. It takes forever to find a decent connection, I have cable modem.