Like Mistaya I reached HNM/RAID content in both games so here is my offering of wisdom:
WoW lv 1-59 is awesome, you see all the shortcomings of FFXI and you think, wow if FFXI had some of this stuff it would be really great. I liked the idea of the instances, they provided storyline and a goal to get a couple of lvls in rather then straight out grinding. Quests with real rewards that motivated you to continue playing. Crafting that was useful from start to finish.
Then you hit 60 and it turns into some shitty EQ clone, I'm serious, a diff team did 60/endgame and it shows. It's absolute shit. You deal with incredibly lame lockouts and then bugs that make those lockouts even worst. You can't even kill the hardest boss in the game yet because they overpowered him on purpose and added bullshit time restraints of fighting him only 2-3 times a week. You can only do the endgame content every 7 days, its just like Dynam :[
You think, okay so 1-2 days out of the week I actually do endgame stuff.
I'll go start an alt...then you realize you have to farm for gear, money for this alt since its a new character. Since theres no way for any of your other friends to know your on an alt you miss out on everything, unless you inform everyone in the game you have an alt, please take the time and look for me when something comes up. Sigh.
The biggest problem of WoW is when you do need to work as a team most players are stupid dipshits, were talking worst then Valkrum Dunes quality here even in the endgame instances. No one puts effort into their character's gear and isn't willing to maybe understand they are playing their class wrong.
When you play WoW you scoff at anything that some other player claims is work. Take farming in WoW, it takes 3 days of real work to buy something in its equivalent of an 1 mil item, compaired to the weeks it takes in FFXI via normal means for someone under lv 60. My raid group got sick of me real fast when we fought Onyxia and I just yawned... oh look its Fafnir lite...zzz
Also the devs dunno wtf they are doing, they keep nerfing shit or adding stupid things that piss everyone off.
Classes are pigeonholed and useless unless you can heal things or a tank.
If you played FFXI and decided to be a DRG and go play a Hunter in WoW, just go cut yourself with a razor.
What's incredibly sad is you don't have to do things pigeonholed to finish anything, using some tactics and creative thinking will get you through 99% of anything in WoW, unfortunately the playerbase is now into pigeonholing...you know everyone bitched at FFXI about that but look what happened in WoW :|
Play WoW for 5-6 months hit 60 do the incredibly lame endgame for a while and forget about it, don't grow an attachment and you will have fun.