Yeah leveling up is not that challenging but then again it really should not be, I still have nightmares about my blademaster in daoc at release who could kill nothing but green con mobs (lowest possible level that still gave xp) and every 30min I could solo a blue con (2 levels lower) with a 30min cd ability while everyone else was happily grinding yellow (same level) monsters :-/

Anyway the ranger bit is a bit odd, I never played a ranger but I saw quite a lot of videos with the pets tanking everything quite well, though these where a bit older (beta2 maybe?) so they might well have changed how much the pets can take