Except one raid per patch is how it's been since nilla.
Please learn how the game is before complaining.
Except you are wrong
Vanilla doesnt start at Wrath.
AQ came out with a 20/40 man raid instance
SSC and TK
BT and Hyjal
The only tiered raid instances that have consisted of bosses in the range of firelands has been BWL and ToC. BWL was made when this game was still in its infancy, and progression was much different than it is now. For that reason alone the 8 bosses that came with the instance were acceptable for the most part. ToC was the biggest raid mistake Blizzard has ever made. Hence why people are skeptical.
BC started with only one raid, which is why they HAD to release them two at a time. The first patch pushed them up to three raids, and the second pushed them to five. Cata will be at 4 raids by 4.2, which is more than nilla had, more than LK had, and one less than BC had.
AQ was also in patch 1.9. You know, end of nilla?
Oh, and since you can't count? SSC had six bosses, Hyjal had five, Sunwell had six encounters (granted a couple had two spawns instead of one but still one encounter). Naxx was nilla's true endgame, hence why it had a ton of bosses; same with ICC. Uld had a lot of bosses to make up for the fact that LK had lots of raids with only a boss or a handful of bosses.
I don't see the problem.