Marshall, I think you're seeing the cup as half-empty, whereas I see it as Half-Elvish.
(OK, sorry, that was
bad...)
I'm going to continue this because the discussion interests me, and you've actually making me think, but I don't think either of us are going to change each-other's minds... And that's cool, y'know. I just don't want to come off like I think you're wrong for thinking the way you do about Half-Elves. If they don't work for you and you'd really like them to, I agree that pretty much sucks. As a DM that's the sort of thing that I'd want to sit down and discuss a house-rule for.
Plenty of DMs have houseruled Expertise into their games, this is just a less general issue. Unless the other players object it's not out of bounds to handwave a feat that you don't really want to take, but feel you need to. Do you have any specific examples of a case where you really want a particular at-will (or one of a particular type / set of at-wills) for a specific character concept and it's an undue burden to make that work?
I do personally look at Eldritch Strike as a kind of "default choice" for Dilettante. It works off of either of your racial abilities (so almost certainly a primary or at least secondary), doesn't require an implement, and neither being an Arcane attack or the push are half-bad. But there are always going to be other viable options. The real "pitfall" tends to be the same one that Humans can face: your normal at-wills can be so good that you really never end up using your third. (And, honestly, isn't that the kind of problem that's
good to have?) Half-Elves at least have more varied choices, making it easier to grab something "different", even if you only end up using it once in a while. Eldritch Strike, frex, can be pretty damned nice for a ranged character who gets stuck in melee: take one hand off of your bow, minor action to draw a weapon (or use your bare hand at low levels, or use your staff, or etc.), Eldritch Strike to push the enemy out of OA range, and then run! If you aren't getting cornered by Lurkers and such all the time (or, specifically: more than once per encounter), you could probably even skip Versatile Master if you wanted to...
What good is the MC feat?
The class-specific MC feats are one of the first things I grab in 4e, pretty much that or a racial superior weapon feat (Dwarven Weapon Training, Eladrin Soldier, etc.). An MC feat gets you another trained skill (and, IME, the party really wants 5 more trained skills),
and another bonus - usually a pretty good one for a feat. And I can find all sorts of neat stuff to grab from MCing, even without any power-swapping. Feats, Paragon Paths... There's some nice options there.
OK, I can agree that mixing implements is usually not a great idea. Part of what I've been trying to say is that just because not every option is great, that doesn't make Dilettante useless. And you can get around the issue in some cases (Arcane Implement Proficiency, Star of Corellon), so those still can be viable options. Yes, you have to be willing to take at least an MC feat to support an implement Dilettante power. Look at pretty much any class - there are going to be a number of powers that just don't work for a given build. Cleric, for instance: not every Cleric is going to pump Str and Wis, and that's going to limit the character's options. That doesn't make Cleric a bad class.
Dilettante <> Multiclass. They arent connected unless you build the PC around them.
Lets use an example here, take a Half-Elf Bard. This guy should be the master of Multiclassing, but the only implement he can use is the Wand. This restriction undercuts all the supposed freedom the class has. Realistically, if he wants to use his Dilettante power he needs to find a CHA based Wand or Weapon attack. Wand Classes? Artificer, Wizard, Warlock. Only Warlock uses CHA. CHA/Weapon? ...Assassin?, Paladin?
So realistically here the Bard MUST CHOOSE a Warlock power. AIP could open up SOR powers(at the cost of a feat), while AD and CV open other classes but again you are spending a feat just to get viability out of the option you should get for free.
Bard gets to use Bard implements (ie: a wand) with Bard powers, and that's it. If he Dilettante's a Wizard power, he can't use an implement with it, unless he picks up a Wizard MC feat (which specifically lets him use Wizard implements, including a wand, with Wizard powers). Alternately he can take Arcane Implement Proficiency and pick any implement from any arcane class and use that for all of his arcane implement powers. MC feats make Dilettante implement powers work, that's why I say they're connected. Without them you're limited to weapon powers or AIP or Star of Corellon.
I'm making a Bard right now. I'm going Cunning, because I like turning the party into near-Goblins, so my Dex starts at 16 at 1st level. I'm going mainly melee weapon powers (I have a bow-based build but the way the party seems to be shaping up I think the longsword is a better option). And I want a Divine MC at some point for flavor / paragon path. My short-list of Dilettante powers is: Ardent Strike, Virtuous Strike, Eldritch Strike, Intuitive Strike*, Furious Smash*, Luring Strike, Commander's Strike, Righteous Brand* Demoralizing Strike, and Ire Strike; I could also include: Pressing Strike*, Demon Dance*, Astral Seal*&, Dragon's Tail*&, Thorn Strike*, Eyebite&, Wolf Pack Tactics*, & Winged Horde&, but I think ten is plenty to choose from. Powers marked with a * would want Adept Dilettante, those with & would want some form of implement-correcting.
The only power I really looked closely at but couldn't see making work was Mantle of the Infidel (Swordmage in the party), specifically because Invokers don't use Holy Symbols. If I was going Prescient I might go for it - but Acolyte of Divine Secrets can get it for me once per encounter, anyway. I could take Grasping Shards from the MC feat, but I don't want to load up on too many ranged powers for a mostly-melee character. Then I'd probably AIP into rods so I wouldn't have to juggle a wand.
It doesnt. For every choice it gives, it takes away another.
I don't understand this assertion. How does Adept Dilettante take any options away? Am I just misunderstanding your point here?