Most of the ME2 and ME1 DLC (minus Pinnacle Station because of them losing the data supposedly) you mean, but those were never sold on PS3 before - previous copies already included those. (They never released a version of ME1 or ME2 on PS3 without them)
It didn't include:
ME2 - Arrival
ME3 - From Ashes, Leviathan, Omega, Citadel, Genesis 2
(plus tons of "buying power" DLC that I skipped - only counted content + Genesis 2 because the comic is handy for experience alternate versions without full replays)
Mass Effect Trilogy - Mass Effect Wiki - Mass Effect, Mass Effect 2, Mass Effect 3, walkthroughs and more.
It is literally the same as buying each one in the store individually at the base version with none of the DLC sold in the PSN store - any that are sold in the PSN store with the exception of the ME3 Online Pass aren't included.