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Other than your personal opinion, if we compare the franchises....

Originally Posted by Wikipedia, on Nodame cantabile's reception

The manga of Nodame Cantabile received the 2004 Kodansha Manga Award for shōjo manga,[63] and was a jury recommendation at both the 2005 and 2008 Japan Media Arts Festivals.[64][65] It was a finalist for the Tezuka Osamu Cultural Prize in 2005 and 2006,[66][67] but did not win. In 2006, the English translation was named by the New York Public Library as one of the Books for the Teen Age.[68] The series is a perennial best-seller in Japan: the first 16 volumes sold over 19 million copies as of January 2007;[69][70] volume 17 was the third best-selling manga on the Oricon charts for 2007,[71] and when volume 19 was released, it reached number one in the Tohan comics ranking the week of its debut in November 2007.[72] The series and its associated music albums are credited with increasing sales of classical music in Japan.[73]
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The live-action drama received the 2007 Japanese Drama Academy Awards for Best Drama, Best Lead Actress (Juri Ueno), Best Direction (Hideki Takeuchi), Best Music (Takayuki Hattori), and Best Title Song;[70] the show was also recognized overseas as Best Miniseries at the 2nd Seoul Drama Festival.[citation needed] Juri Ueno also was named Best Newcomer at the Élan d'or Awards for her performance,[citation needed] and the next year was named Best Actress at the International Drama Festival in Tokyo Awards for reprising her role as Nodame in the television special.[87] The first soundtrack album for the drama, Nodame Orchestra LIVE!, reached number seven on the Oricon album chart, breaking the record for highest ranked classical music album.[58]
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The opening episode of the anime series broke the record for audience share for its time-slot.[89][90] The first DVD volume debuted at number 3 on the Oricon chart for anime the week it went on sale.[91]

Let's compare it with Haruhi's

Media sales

DVD sales in Japan have been strong with 70,000 and 90,000 units sold of the first two DVDs respectively as of August 2006.[26] A 2006 online poll of Japan's top 100 favourite animated television series of all time, conducted by TV Asahi, placed the series in fourth place.[27] By the end of 2007, the seventh installment of the series sold 45,000 units.[28] The series has also become somewhat of an internet phenomenon in both Japan, Asia and English-speaking countries. Over 2000 clips of the series and user-created parodies and homages were posted to video sharing websites such as YouTube.[29] The popularity of these clips (and those of other popular Japanese series) lead the Japanese Society for Rights of Authors, Composers and Publishers (JASRAC) to request that YouTube remove clips protected under copyright.[30]

[edit] Awards

The anime won the Animation Kobe Award for TV Feature in 2006.[31] At the Sixth Annual Tokyo Anime Awards, the series won the category "Best TV Anime Series," along with Code Geass and Death Note. Furthermore, Aya Hirano won the "Voice Acting Award."[32][33] She also was among the "Best Actress in a leading role" category from the first Seiyū Awards.

I rest my case.

I mean, I'm a Haruhi fan as well, but you have to keep things in perspective