Just to point out what seems to be a common misconception -- you do NOT need Ritual Caster to cast a ritual from a scroll. Your 24th level fighter can cast any ritual he wants, with no feat investment, provided he has a scroll and the appropriate components. Hell, a first level fighter can -- there are no level limits on ritual scrolls. Joe the peasant farmer can cast Raise Dead, if he has a)a scroll, and b)Gold. Since there's no chance of the skill check failing, he doesn't even need to be Trained in Arcana to have a decent chance of succeeding. Heck, he can have an Int of 3 and still do it.
The multiclass feats are powerful, in that you're much better off taking them than Skill Training if there's a skill you want that's a class skill for the other class (and you meet the prereqs), but they're not really unbalanced otherwise. I personally think Initiate of the Sword is pretty weak compared to the others (Hmmm...Sneak Attack 1/encounter or +1 to hit 1/encounter? Hmmm....), but that's just me.