Also 55 is the easiest level to gain aa's on for almost every class, especially true for twinked out paladins. Sauga had 250 aa's or so at 55 from soloing lasanth mutants and grouping in firegrotto elemental area(lol)
Crystal caverns is really underrated, it has a decent number of mobs/nameds and a decent respawn timer. The spiders are easy to solo, but they are fairly annoying with their unresistable root. Orcs come in many pulls and are dangerous due to casting fear. Terrors/dwarfs are not that bad.
Geonids hit way too hard/too much hp to be worth it.
Really noticable old-area-xp-penalties almost everywhere + general xp penalty from having more than 50 and again 100 AAs can make life miserable if you arent the patient typ(I am).
Additionally you're competing with 65s for attractive areas like CC/EW-orcs/DN-rats/Lab.
If asked ingame I recommened get RS3 at 51,then rush to 65.Saw players who definitly
sucked at playing their toon making 65 + ~200 As in less than a month occasionally.No,no names.
(Still wish they would lower the requirements for VE to mod maps to provide a bit more variety
in the 50s)
Here my 55/130 *main*:
http://www.shardsofdalaya.com/fomelo/fomelo.php?char=uland
and his box-healer:
http://www.shardsofdalaya.com/fomelo/fomelo.php?char=meldurh
Going from top tier top dog hot shit at level 55, and hitting 65 everything no matter what ends abruptly because you are suddenly shit no matter what unless you went and farmed a full set of raid gear and 300~ aa's at 55.