I cannot tell you how much I agree. DP's batch of evos was perhaps my favorite bunch of new monsters, and my biggest disappointment with Gen 5 was a failure to follow that up.
Really, I'm kind of obsessed with this sort of thing, even though I don't really play competitively. It just bugs me when "useless" (broken/imbalanced) Pokémon are introduced when we already have so many that need to be "fixed".
And it doesn't have to be strictly evolutions. I really loved what Platinum did for Rotom, and the hidden abilities really breathed life into the monsters with more lackluster standard abilities (like Politoed and Ninetales, although those two might be a little overkill given how dominant those abilities can be...).