I don't know about tactic wise, but each of a legend is rarer than a prime by itself, so from that viewpoint it was
WELL it depends...
Primes are definitely more playable (especially Espeon :P). I have yet to see a deck with Legends that doesn't crash and burn. I tried one, it failed. Miserably.
However, you got more value... getting a full Legend is always nice, and moderately rare, so I'd definitely have taken that deal.
So it depends... playability, then no, but rareness/value, then definitely a good deal :)
So... I herd u liek Mudkipz?