Re healing surges, that was a misleading statement, I meant, after the encounter ended, we had to use most of our remaining surges in order to be battle-ready again. I think 2 of us used second wind, and as I mentioned the fighter used all 3 utility powers to stay alive (and he still entered dieing)
Regarding attack bonuses, i'll tell you how mine is made up, as I mentioned in my post my ranger has a +5 longsword in the MH, +3 scimitar in the OH, my strength is 1 above what it should be due to a magic book (gogo 3.75

) making it 24, so:
STR + 7, Weapon Enhancement +5, Weapon Prof +3, 1/2 Level +5 = +21 MH
Str + 7, Weapon Enhancement +3, Weapon Prof +2, 1/2 Level + 5 = +17 OH
I appreciate these are higher than you might expect for characters our level for the reasons I mentioned. Factor in combat advantage for the whole encounter and +23 vs 34 AC is 11 to hit, not too shabby.
Our fighter has the same strength as me, +7, a +4 weapon, prof bonus of +2 for a greataxe, and half lvl +5 so that's +18, plus I think fighters get +1, so +21 with combat advantage. So far from a natural 20 for our group at least.
As for the nightwalker attacks, yeah, it hit us a lot, but we hit it a lot too, and our team kicks out a lot of damage when the dice land right.
As for the reach on the NW, i'll have to take your word for it since I don't have a MM, but surely reach would only make the fight even harder!