In the 1960ies, I would have probably given 9 points...

Rating: 8/10 (27 October 2012)

... but currently 8 "only" - mainly for the three following reasons: -- This film did not have similar effect on me as One Flew Over the Cuckoo's Nest, Pulp Fiction, Godfather - to name a few from later decades -- Some too long nature/battle scenes and overall length of over 3,5 hours -- Totally male cast, no female characters
Of course, the film is great, and even supporting actors are those capable of starring (and they have done so, e.g. Guinness, Sharif, Quinn). O'Toole is amazing and it is a pity he received an Academy Award nomination only. Directing, volume of mass scenes and music score (Jarre) are also elements remarkable today as well. Many contemporary well-known directors have mentioned Lawrence of Arabia as their guiding light.
If you have time to absorb and are keen on history, then the film is definitely for you.