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I tried to retrieve any info regarding the Legio Astartes of the Blood Angels; unfortunately I managed to get almost no information.
Did they have a particular organizational pattern?
Some particular beliefs?
Did Sanguinus establish some relevant changes into their organization?
Any Baalian/Terran conflict and/or integration problem (e.g. Black Ravens, Dark Angels)?
Did they were designed according a particular Earth culture (e.g. Ultrasmurf are greek/roman, DAs are medieval knights and so on)?
The former 9th Legion appears to me as truly deserving the designation of "Vanilla Marine".

make up wise they are very similar to the 40k angels, though lacking death guard, they have sanguinary guard etc.

the rest we wont know until they get the proper 30k treatment, id expect 30k varients of sang guard, baal preds (possible) and the like

I'm going to arrange these in a roughly similar pattern to your question, so here's some things that I know about the Blood Angels Legion:
Organisation: Their companies are 400 battle-brothers strong, but their squad designations and organisation within the company are very similar to any other legion
Beliefs: They really like Sanguinius? They drink their brothers blood to strengthen their brotherhood and they keep a small amount of their fallen brothers' blood in a small phial to honour their memory.
Changes Sanguinius Made: He established the Sanguinary Guard to serve as his bodyguard but apart from that I don't know.
Baal/Terran Conflict: There is no reference to it in the fluff that I have read, so I suppose we can assume that the two planet's people joining went smoothly.
Old Earth Culture: They appear to have a biblical theme going on that switches between classic gospel and Roman Christian. This mostly comes through in how they name things (The Day of Revelation being their first attack in a war of belief is a good example) and how they go about their business of war (burning the unbelievers and showing mercy to those who repent/switch beliefs)

So they weren't quite vanilla (not as vanilla as say, the Imperial Fists), not that being vanilla is a bad thing (I mean, the Imperial Fists are pretty cool), but they have yet to have major legion lore published (which will probably come when they get their legion-specific units) but there are still differences to standard Legions in there.

They were named the Hell Raiders, while still fighting in the Wars of Unity. Probably because of a massive usage of bikes and jetbikes? Perhaps due to their recklessness?