I just checked the xp from reps in plague forest on the wiki and its not even near the xp of the pirate rep. Is plague forest worth it?
Which rep quest do you mean? There are more than just one rep quest in Plague:
-(REP) Wolf's Howl lvl 34 - it's lvl 34 and bonereef pirate rep is lvl 38 so of course it gives less exp ^^
-(REP) Expansion of Werewolf 38
-(REP) The Ungrateful Dead lvl 40
-(REP) The Plague lvl 41
The rep quests in which you have to collect items give you nice exp since the items are not supereasy to get, so you get exp as you grind too ^^