I am agape with fnords
No, only in your particularly biased interpretation of them, not the actual text.
After all, throwing yourself on the bullets of the enemy if a well-known high level tactic that often leads to victory.
Or the story described as "It's the battle of the shadows as the Raven Guard meet their equal in the midnight killers of Commoragh. Who will prove to be the masters of the night?", which is actually a series of rushing defeats as a Group of space marine novices easily out-stealth some of supposedly most dangerous combatants in the galaxy, easily schooling these mere centuries-old killers while only suffering a single, toke loss of their own.
We all know that crushing, overwhelming victory is a sure sign a military force has met their equal.
And of course being killed by so many random people that you are literally turned into a in-setting joke for a "easy task" is a sure sign of being a dangerous and feared God of War.
And I am very sure that many, many powerful space marine special characters have been killed by mere grenades after only killing a score of enemy combatants.
I am completely sure all of that is very true. /sarcasm
Who knows maybe one day Xenos and their characters will be afforded 1/10 of the respect and dignity space marines get by default. But I very much doubt that will ever happen.
Hey, maybe the total number of convincing Eldar victories in novels over lojalist Astartes will be a whole whopping five in number! Now that would be something to celebrate.