What exactly do you mean by "saving" the quests?
Because of how the mechanics work, you need to do quests at and just below your level several times. Skipping ahead works out to a penalty in the long time because throwing potential xp gains away when you have a limited amount of packs lowers the ceiling you can reach.
Like you're level 14 in the first quest the Lords of Dust and we'll count Aggression (+10%) & Ransack (+15%) in things too.
On Normal the base xp is 5,100, optionals (excluding rare spawn) are 510xp, 765xp, & 510xp, total 6,885xp.
On Hard the base xp is 5,300, optionals (excluding rare spawn) are 530xp, 795xp, 530xp, total 7,155xp.
On Elite the base xp is 5,500, optionals (excluding rare spawn) are 550xp, 825xp, 550xp, total 7,425xp.First run ever is Normal you'll get +25% for Normal & say +20% for Daily for +11,704xp then immediately running Hard next will give you a +40% for Hard & -25% for Level Difference for +10,017xp. The two runs were worth 21,721xp.
But if you waited until you were level 15, Hard would have given +11,805xp (or +13,236xp if you also waited a day to rerun) for an "extra" three thousand xp by just playing the game as intended. It's not much, but Dust gives the lowest amount of xp out of all of them and you ran six quests too soon. I suspect your losses are somewhere around 25,000xp, maybe 30k (excluding running them 'right').
so I kind of rushed through them a bit just to see what was so special about FR in the game.
FR was the first expansion for DDO, everything else was updates, and it was a pretty large drop on the community.
Fan bonuses included stuff like access to FR, Eliminster, and so on. Mechanically, besides all the typical fixes, the entire range of content was sold as an expansion which cheaper than buying the separate components through the DDO store. In all you get fifteen new quests, technically four explorers and one of which used a new Encounter system to replace the old standard of simply using red named monsters. Four new Challenges were added as well. Epic Progression was a huge focus as well, the level cap changed from 20 to 25, quests previously simply had a "Epic" difficulty level gained a Epic Normal/Hard/Elite scale, and Epic Destinations were added. And the Druid Class was added too.
I don't know how other classes wind up, but my Ranger feels really strong, and always has since pretty close to the beginning (maybe level 4 or so). I calculated that I'm doing somewhere between 150 and 200 DPS with my bow, and I haven't included the effects of things like Sniper Shot, Merciful Shot, Manyshot, multi-target from Improved Precise Shot, etc. in there.
Bow-focused Rangers have a ton of survivability and the damage seems utterly amazing if you play in a vacuum.
I'm not too sure what to say on how to expand your expectations, how about I've seen five digit numbers on a couple different characters of mine?