I'd just play through it TBH.
Played through Halo on legendary and thoroughly enjoyed it - got pretty tricky occasionally too.
Then, after a good long while, i realised halo 3 was out this week and decided to play through Halo 2... when i'd first got it i only managed to make it to the 3rd level before finding something else to do.
Wish i'd gone through it earlier as i found it to be thoroughly engrossing and enjoyable if a little more linear than the original Halo.
If you have 3 or 4 evenings worth of time to kill i'd just play through the lot if i were you!
gt
Played through Halo on legendary and thoroughly enjoyed it - got pretty tricky occasionally too.
Then, after a good long while, i realised halo 3 was out this week and decided to play through Halo 2... when i'd first got it i only managed to make it to the 3rd level before finding something else to do.
Wish i'd gone through it earlier as i found it to be thoroughly engrossing and enjoyable if a little more linear than the original Halo.
If you have 3 or 4 evenings worth of time to kill i'd just play through the lot if i were you!

gt