Warning, long reply alert.
Several people have posted upthread that they think she has a good voice. The concensus seems to be about evens so far.
Yes, I personally think she does have a good voice, I missed her performance at Glastonbury, but I don't think anyone who is getting over a chest infection would be able to give their best singin performance. Maybe some that are slamming her are forgetting this (and I am putting aside the thought in the back of my mind that she MAY not have been 100% clean)
To win the awards she has, you need to sell records, and therefore need talent in the first place. I personally do not think Eminem has talent, but he has sold millions of records anyway.
This is probably the most repeated and misunderstood rubbish that has ever been uttered about the music industry. FACT you do not need to have talent to sell records (if I wanted to be flippant I could list a few artists to illustrate this, but I won't), all you need is an understanding record company and a bloody good plugger. Also the reverse is true, if you have a great talent you will not necessarily sell a lot of records (again management and plugging come into play). thankfully this state of play is starting to wane now that sites like YouTube etc are assisting in Viral marketing, but even they are being perverted for the record companies gain (without YouTube et al we would not have had Sandie Thom, KT Tunstall or numerous others out there as they would have been seen as to niche by the A&R men)
The only disagreement is whether you or anyone else thinks she has talent, and that is entirely your own personal preference.
Not 100% true, and my major beef is the use of "she has won this award and that award so therefore must be good" to try and prove your point. As I previously mentioned music awards (barring a few smaller awards that are truely judged on merit, not on earning potential, such as the Mercury Music prize) are just there to allow the bigwigs at music companies to slap one another on the back and say "didn't we do well" they mean sweet FA in the grand scheme of things. I am not saying people should not have their own view, and many do, and many will disagree with me, such is life.