all stats are important...
you realize pokemon get hit in battle right, even if you successfully dodge.
why dont you go out and use the lapras, use it against dragonites. pretty sure you would do well against them. u can try it out on rock and ground types too, if they dont have rock moves.
avoid machamps.
basically learn your type matchup :P
i mean if its bad, are you honestly going to throw away that lapras?
go out and try out lapras, what are u doing man? lapras is cool.
I think the real question you want to ask is, whether Stamina is an important stat for an offensive pokemon. and the answer for this is yes. like i said before, pokemon still receive damage even if they dodge an attack. so it is best to have good stamina along with defense even if they are an offensive pokemon. im sure your lapras will do well anyways with that low stamina. just know that a higher iv stamina lapras with equal atk and defense and moveset will last longer in battles. seriously though, try lapras out because only you can judge on your own if lapras is bad or not. and if it is bad, its no big deal.
the only thing is that your lapras will seemingly be less strong because of less CP but it can probably take down pokemon of equal level. this is why you should test it out in battles before asking here you honestly can find out how well it battles by battling. why are you depending on people to answer that for you. not like i have a 15/14/1 offensive lapras on me.