i think sunny

Sunny and Hyoyeon

In some ways all of them but Sunny and Hyoyeon are still the "least" in most polls.

Sooyoung
and Sunny's singing skills

Sunny...as far as Hyoyeon is the least famous member, but at least she can show of her dancing skill by being the main dancer in SNSD and participate in DWTS. but Sunny? her singing skills is so underrated.
she receiving a lot of attention during the boys was just because her new hair cut. she didn't get many lines in that songs..

i don't see how Sunny is underrated? people always talk about her "beautiful voice" and she's recieving a lot of attention since "the boys".
also, she's having TONS of lines on their recent albums. the japanese album was just shocking. they gave her more lines than Tiffany and Seohyun and almost the same as Taeyeon's

Hyoyeon would be my second choise, but think about it, SM already gave her an opportunity to shine on DWTS. and she did

that's why i choose Sooyoung. always in the shadow of the others membrs for no reason. great singer and dancer. and Lee Soo Man said she was the best actress. i just don't get it. it looks like the company doesn't like her

Yuri isn't underrated, she shouldn't even be here

Here is how I see it

Sunny- Well she is underrated in the sense that no one thinks she can sing, dance, or is worthy of being on the team. She isn't considered pretty by a grand majority and she only popular when she isn't in the shadow of the SNSD name, ie IY or other variety programs. From an anti perspective she is "fugly" annoying cute and sounds like a chimpmuck.

Hyoyeon- she "can" be considered underrated but that is really not anyone fault but hers. She really needs to work on personality because I think she isn't underrated she is just not popular. What do I mean? Everyone knows she can dance and rather but its not opinion that she isn't the prettiest member, so that is tons of attention away from her and the fact that she doesn't have a likeable personality to the public. From an antis perspective she is "fugly" and doesn't have personality.

Yuri- Now here is a different story because she isn't underrated in anyway but she can be considered overrated.

Sooyoung- She is in some way underrated too. I think people only care about Sooyoung's looks not her talent. People brag for days how "long" her legs are but does anyone even care about her vocal talent or her dance skill, or that she speaks three languages? From an antis perspective she is rude and is only useful for her body not her voice or dance.

Sooyoung is second underrated . and people like sooyoung because she is a great dancer. and sunny is not underrated maybe she is third underrated , i think sunny is more popular than yuri.

Hyo and soo too

i agree with tiagih, about sunny and hyoyeon

For me the most popular is Yoona and least popular is Hyoyeon.

1.Yoona
2.Jessica
3.Taeyeon
4.Seohyun
5.Tiffany
6.Yuri
7.Sooyoung/Sunny
8.Hyoyeon

Sooyoung is become more popular now.