Is Halo better than Halo 3?

I can remember when Halo was originally released on the Xbox, sadly I never got to play it because I owned a PS2. Recently however I purchased a copy of the game in a local store & discovered that I was able to play it on my Xbox 360. Within around 10 minutes of playing I have to say that I enjoyed it a lot more than Halo 3; there were more enemies to kill & the game seemed better designed. I'm now on the lookout for a copy of Halo 2 which a lot of people still say is the best Halo game ever made.