DM-Rocco
Explorer
I generally like many of the multiclass options in 4e and one thing worthy of a mention is the flexibility it offers over a campaign rather than just in any individual situation.
Multiclass characters love to level up! Every time you level up you can swap all your multiclass powers for other powers in addition to being able to retrain, which provides all sorts of options.
For example a character with 3 power swap feats in fighter could upon leveling, after finding that the player of the recently dead cleric has decided to roll up a wizard, swap all 3 powers at once to 3 that provided a healing or regen benefit such as boundless endurance and victorious surge
The next level the party discovers they are about go on an adventure to fight undead so the same character retrains the mc feat to maybe paladin and then swaps 2 powers to radiant smite and martyrs retribution which deal radiant damage (still str based) and the other power back to their original class (i'll let you worry about the back story)
A couple of levels later the undead adventure is over and the character swaps back to fighter taking some now higher level powers
This flexibility is very hard to gain in any other way - effectively being able to change up to 4 powers per level up including retraining.
I agree that losing the AP bonus and other abilities is not made up for by the swapping of the at will but I disagree that the powers are understrength. A 7th level encounter, 10th utility and 19th daily is about right for a paragon class. Most paragon classes have 1 cool, 1 ok, and 1 pretty meh power I'd say. At least with paragon multiclassing you can pick the best. Lets be honest - all powers are far from equal
To continue the fighter theme, imagine a paragon class with rain of blows, strength from pain and quicksilver stance. You would snap it up (we're all powergamers right ;-) )if it had even a half decent AP power to go with it (of course it doesn't which is a shame).
I reckon thats just because there are 5 classes which key off strength with lots of secondary CHA and WIS effects. And only two of INT. Hopefully PHB2 will improve this
By 10th you can get about 25% there, by 20th its close to 50% and in epic you can make it to nearly about 85%. You can create a fighter which has no fighter encounter powers, no fighter daily powers, 4 fighter utilities and 1 at will. Meanwhile it has 4 encounter and 4 daily powers from up to 3 other classes and 3 utilities from 2 classes. The main problem is having to wait until epic to do it
Are you reading that correctly?
When I read the power swap feats you can only swap one power from your base class, not freely pick between all your powers over time to swap them all out.