@ANBEY ISAI, yes. it's good. some people say it's not nice because all the songs have techno feel but the genre of the movie is as such.
but i do have other opinons, let's wait til i get more answers.
@SAM and ARJUN, nalla irukku.
puthiya manitha is excellent. rahman yen no. 1 composer'nu inthe paatte ketta puriyum.
irumbile oru idhayam is superb western.
kilimanjaro is above average.
matthe songs ellam enakku ennamo avegare mathirithan irukku (among other ARR songs). ARR rajni'ku kuduthe music'leye best sivaji the boss than. i expected this to overtake sivaji but sadly it didnt. for a soundtrack, composing comes first, sound engineering next. i think, here, rahman concentrated too much on the sound engineering part (with rasool pookuty) and overlooked the composing.
ithu ennode personal opinionthan. let's hear from other answerers.
@MEERA tangachi, praise pannuma, pannu. vaay valikire vareikum ( i mean type panni kai valikire vareikum) praise pannu. enakku apdi vaai / kai valikire vareikum praise pannenumnu thonurethu enthe paatuku teriyuma? irumbhile oru idhayam. woooooooooooow!!!!!!!!!!!!!!!!!!! im in love with this one.

my honest review
i simply love this musical treat and i m enjoying.
People cud understand the soul and content only if they have good speakers.

Innum naan antha songs laam kekala sister. . . . kettathum solren. . . . but eppadi irukku?nalla irukka. . ungalukku pidichirukka?

i like kilimanjaro and boom boom robo da. . . . but other songs are average in my opinion

Wow akka
Really great composition
ARR didnt disappoint us atleast he didnt disappoint me i feel
Kadhal annukal an evergreen song for me, simply superb composition,especially shreya's voice . . . . . . . . . awesome. . . . . . !!!!!!!!
Arima arima -Outstanding one,chorus was gud,a different one,to say on the whole mindblowing song
puthiya manidha- again a great work. S. P. B,A. R. R. ketkanuma really brilliant
Other songs were also gud but ennaku idhuku mela praise panna words theriyaadhadhunaala inga stop pannikaraen.

1. Pudhiya Manidha
2. Kaadshal ANukkal
3. Arima Arima

well it was different but it was not that good as ravanan songs. . . idk i liked ravanan songs more that endhiran. . . . i shud say arr songs keka keka dhan nalla irukkum. . .

Shivaji was better. . letz wait & c