Obryn
Hero
Mutliclass feat perks are generally fairly small. They kind of have to be - they're already basically Skill Training +2.I have to say that given the hit point inflation that you see in 4e, little bits of bonus damage (less than at least 1d6) seem particularly lame to me. They don't help you against minions since any damage kills them and the impact they have on elites and solos pales in comparison to the amount of hit points they have.
In addition to giving a trained skill, they serve to qualify a character for paragon paths (which is sometimes very cool), feats (again, sometimes great), and the various power-swaps. Anything else you add on top of that almost has to be minor.
Basically, multiclass feats don't need huge perks.
(also, probably 2/3 or more of the foes you face in a game are regular opponents. +1d6 isn't huge, but sometimes those 2-3 extra points make the difference.)
-O