To be honest 'bout when the first time i saw the title "is this LOVE?" thought that it gonna be another Spring ballad like Moments. Then when i had heard the completed full version. I was really surprised that it's another rock song because Hamasaki Ayumi only seem to release rock song on Summer single or album only. So yeah! I've to say that this is a really freakin' awesome because i really love her way of rock. Yup! Yup! Yup!
I'm gonna rate it 80/100. As for the first 10 is because of the openin' "Whoa whoa whoa yay~" kinda destroy the beautiful openin' music
FOR MEH. Yeah! I know how sume poeple love it. Kinda like Moments openin' with that "Lalala~"? As for the other 10 is because when it reach to the chrous that been repeat many times have kinda cover a little of Hamasaki Ayumi's vocal. Honestly, the first time i heard this song i was Argh! ,but after sumetime i really love it.
STEP YOU! For those poeple dun't like it. Please try to listen it a few more times. 
As for the lyric, i love it. Though i really hate how lyric sume part have to be so repeative.
I think "is this LOVE?" can beat "GAME" ,but nut "Because of You".