I hunted there starting at 10, solo, untwinked, with an Iksar Necro.
The frogs near the zone will assist/add, but you can split the spawns via root, burn/zone, lull, or zone splitting.
Sure, you can't clear down farther than the crescent bridge... but at L10 your mana/hp downtime won't allow you to keep up with that many kills anyway.
Kills are of course slower, due to more downtime per mob... but the huge ZEM and lack of trains (e.g. BB/SI) more than make up for it imo.
I was also in a group of levels 10-15 that cleared down to the old live Scryer spawn room, which was fantasic xp/loot for a group that level.
We were barely able to keep up with spawns, and had one wipe, but the XP gain was astounding.
Conversely, I don't think a cleric can solo there at 10.. and a group of people that have no idea how to play EQ might also have difficulty at those levels in that dungeon... but if you're playing with a decent group 'o folks and have a solid, diversified group you can do very well starting at 10 imo.