Critically speaking, Thank You has received generally positive reviews. At the online music guide Allmusic, the album received a rating of four stars out of five. It also received a generally positive review from the BBC. Commercially, Thank You remains Jamelia's most successful album to date. In the United Kingdom, Thank You reached a new peak of #4 following its re-release in March 2004, thus becoming Jamelia's highest charting album to date. It has since been certified 2× Platinum by the British Phonographic Industry (BPI) for sales in excess of 600,000 copies. Elsewhere in the world, Thank You has reached the top twenty in New Zealand and the top forty in Ireland and Switzerland.
The album produced seven singles, all of which attained varying degrees of international chart success. "Bout" was released as the album's lead single In June 2003. It featured guest vocals from Rah Digga and reached the top forty in the United Kingdom. The follow-up single, "Superstar" became Jamelia's most successful single internationally to date, topping the charts in Australia and New Zealand. The title track was released as the album's third single in February 2004 and became Jamelia's highest charting single in the UK to date, peaking at #2 on the UK Singles Chart. Following the single's success, the album was re-released with two additional tracks (three including Jamelia's duet with Italian singer Tiziano Ferro on the single, "Universal Prayer", which was only included on international versions of the re-release). "See It In a Boy's Eyes" served as the first single from the re-release and as the album's fourth single overall. It was most successful in the United Kingdom, where it became Jamelia's third consecutive top five hit. "Universal Prayer", a duet with Italian singer Tiziano Ferro, served as the album's fifth single and became Jamelia's first number-one hit in Italy and Spain. The album's final two singles, "DJ" and "Stop!" were released jointly as a double a-side single and became Jamelia's fourth consecutive top ten hit in the United Kingdom.
Jamelia may be widely regarded as the best UK R&B singer in years, but - like most interesting artists - she wears her genre lightly. Although her debut album Drama stole its sound and attitude wholesale from the US, Thank You sees the vocalist take bold steps onto new musical ground. Indeed, Thank You is at its weakest when it is most generic. First single, "Bout", was hardly a promising introduction, its heavy-handed, booming production sounding much like Christina Aguilera's "Dirrty", but without the vocal range and the raw charisma. It tries too hard to achieve too little, as does the embarrassing "Bitch", in which Jamelia tries Pink's attitude on for size but finds it doesn't fit at all.
Jamelia is far more comfortable at the poppier end of the R&B spectrum, where her limited but sultry vocal style flourishes. At certain times in the last few months Capital FM could have been renamed "Superstar" FM, but despite its airplay dominance this champagne pop song still sounds fresh and irresistible. Almost as catchy is the frivolous "Cutie", which nods in the direction of Jamaican dancehall with its giddy, drunken rhythm. But its on the two slowest numbers that Jamelia triumphs. "See It In A Boys Eyes", a collaboration with Coldplay's Chris Martin, is as beguiling as it is unclassifiable. Built on one of Martin's loveliest ever piano riffs, it's a slinky, haunting hymn to understanding the opposite sex. A perfect partner to Prince's "If I Was Your Girlfriend". And then there's "Thank You", the album's focal point and a blistering put-down to an abusive former partner. In the hands of a white boy guitar band, the song would likely have become a squeal of anger, but Jamelia handles it with a grace and wisdom that belie her youth - "You messed up my dreams, made me strong/ Thank you." It's that rare beast, a true pop classic which will be played for years to come. Given the success she is now enjoying, it seems likely that Jamelia's confidence and willingness to experiment can only grow. Her third album should be quite something.