I use my 2Hrs a lot more often in small group settings than in traditional parties (even missions and whatnot). Even some of the questionable ones (Mighty Strikes, pre-Convert Chainspell, etc.) can make a huge difference in a duo or trio.
If FFXIV does have a similar mechanic, I think there needs to be a bit better balance between the classes and throughout the levels. With a handful of exceptions, they're pretty out of whack right now.
As for the summons being a 2Hr-like ability, I'd rather not see it. I always preferred the "summoning as a unique ability" FF games (FFIV, FFX, etc.) to the "everyone can do it" ones (pretty much all of them since FFVI). Mind you, that's just a flavor thing; I'm not going to be upset if FFXIV has univeral summons or anything.
The whole concept that some races couldnt do some jobs in FFXI (read: taru DD or galka WHM) was incredibly annoying.
One of the best WHMs I ever grouped with was a Galka. Elvaan BLM are about the only race/job combo that's unequivocally terrible. Dumb as a bag of hammers...
I'd much prefer that stats/abilities are tied to jobs only, with no (or very little) benefit from race.
I'd hate to see race become nothing but a cosmetic choice. With a few exceptions (the abovementioned Elvaan BLM) I think the current race/job interaction is pretty well-balanced. You gain a tangible benefit for staying in the "correct" field, but can also function in the "wrong" ones without too
much difficulty. Also, outside of a traditional party (and I'm usually outside of a traditional party), some of the racial traits are worth more than they would be. For example: If you're duoing as a WHM, an Elvaan's higher STR, HP, and VIT make a difference, 'cause you're either in melee or riding on your partner's coattails.