haha wow i cant believe people think lee can beat Zabuza, like ok im a fan of Zabuza, but im not going to just overate him, i respect other characters like Lee, but u gotta be kidding me if u think Lee can beat Zabuza
1.Lee can only open 5 gates, Zabuza would be able to survive 5 gates just like Gaara did by possibly defending some of the attacks with water clones for diversions, if he couldnt than Lee should be a very high jonin then.....even though he is a chuunin
2. Lee doesnt go into the 5th gate his first move, him not knowing anything about Zabuza, Zabuza would use his silent killing and hidden mist combo which is very strong and strike lee, i do believe Lee can block this attacks but Zabuza would outsmart him with his water clones just like he did with Kakashi
3.Zabuza has very strong water techniques, his water dragon jutsu is a strong and he has his giant vortex jutsu which is a very strong A-rank ninjutsu
Lee isnt skilled enough to beat Zabuza