I dont know about the rest of you but...I've been hit by swarms of guardians, and marines just can't do the job right over cliffs, gols dont last long, and mutas always keep pestering my wraiths from slaughtering them. Valkyries is a major add on. Bleh, EMP the carries, fly some valkyries in and we're talking about a protoss with a 'red' fleet by the time your valks are toasted. Zerg swarm problem? Heh, dont you just love to do a Valkyrie anti-lord sweep on em, they have to waste another 1k for another batch of 10 lords (while your repairing your valks and preparing for a second run). I dont know, just me I guess, I love Valks. Plus Valks with the Vulture mine / Tank Combo can seriously do numbers on zergs. (or atleast I've noticed it did)

"You called down the thunder, now reap the whirlwind"
"Im about to overload my aggression inhibitors"

"It says....push any key...er um, which one is the 'any' key?"

"Knowledge is Power. Power--Leads to Corruption. So we all go to school to be Evil!"