Yesterday we played this Fight with 4 Lvl.2-Chars and if I hadn't "adjust" the behavior of the Garagg, maybe the whole group would now be six feet under! I only used Leech Life 1 time, but I rolled nearly a perfect roll (6,6,5,5,2) and the fortitude-save failed.
I had to say, my players had no luck at all during this fight (the biohacker-player rolled really the first rolls (d20, in the same order): 1,1,3,3,4 - and the rest of the group wasn't better roller ;)
I don't know how a group of lvl2-Chars should manage the fight: the most weapons on this level are small arms like azimuth-laser with 1d4(!) and as the chars level outside absolom station (e.g. on acreon or the drift-asteroid itself) they hadn't the possibility to buy better weapons.
AC of the best char (soldier) is at 14 - so nearly every attack of the Garagg is a direct hit (2d6+9 = 16 avg. dmg) and Leech Life would do the rest...
Sorry for my English, I am no native Speaker.