If it's your first adaptation of Hana yori dango manga..then...it may be a 7..the story has its flaws, sometimes it is unrealistic, there's a lot of gratuitous and unjustified violence, but the acting is good and, in the end, it is a classic impossible love story between two people belonging to different worlds. The "everything is possible if you hold on and really believe"-feeling is always catchy.

If you have already seen other adaptions as I did (started with Chinese Meteor Garden, passing through Korean Boys over flowers and Japanese Hana yori dango before this one)..well...for me it's a 10..the focus is more on the main couple and their personal struggles, less space given to side stories and therefore less wasted time. Gorya and Thyme are better described and also their thoughts and reasons are better explained. This couple is also the one with the best chemistry and they seem not to be stuck in some simple stereotypical character.
Special mention: Gorya's best friend..finally she has some dignity and, even if she appears a little less than in the other adaptations, she is not a simple naive teenage girl passing by and falling blindly in love for the pretty and rich one.