Yup, it's legit to duo queue, even more when he's not looking for someone 300+ elo over him/her.
The whole "you look like needing for someone to carry you" is mostly bullshit at division I imho, you first have to rolfstomp guys around Silver, then stomp others in Gold to get through.
I failed two attempts out of bad luck (afk, double junglers, etc), and things were getting a bit frustrating as my MMR was climbing (WHY?) into Gold III, i tried solo the last time before going for duos, and BAM, 3-0
Taking away the two lost promos and the one which i suceeded with, my silver I record is 11-4, yet i had my fair share of leavers, troll, afks.. i even won a game with an allied mf jungle T.T
11-4 doesn't look carrylike enough? Yet i almost duo'd the last bit, simply because i wanted to ease the chances of having 2 guys who don't care and will go double jungle even when the rest of the team offers swaps to WHATEVER.
PS: Accumulated is 16-10, not nearly as good, but it just looked like trolls were waiting in the corner for my promos
there's no difference in promotion games than the games you played before, it's still your mmr, if you can handle it before why cant you for these games that all of a sudden became special, same people, and if you have to beat golds, beat golds, plus if youre in silver 1, odds are your mmr is around low plat by time you get to promotions, and yes everyone has uncarriable games, but if youre not able to carry then just work on your game until you can carry, i have nothing against duoing but to me it just sounds like he cant do it solo, so he wants someone that can do it for him, asking for a duo you dont know is the same as being matched with a random player wanting to win, who in division 1 isn't playing to win?