Yeah I'm kinda like that with the whole compilation tbh, love all the prequel stuff, the sequel stuff is still decent but yeah, Crisis Core, Last Order etc. are awesome at telling the backstory with a different point of view even if it means making small alterations.
Was pretty disappointed LO never released in EU, was looking forward to (at the time) DVD quality version of LO but it wasn't on there. And it shouldve been remastered in HD with ACC but nope, so pretty much unless you have either the JP or US limited edition, you won't have this anime. Lame.