Board Thread:Warhammer 40k General Discussion/@comment-112.207.234.222-20160507120912/@comment-27144409-20180910202404

If you want to look at it that way, sure, but I see Guiliman and his sons as the closest things to a baseline primarch and Astartes respectively. Other chapters surpass  them in some areas, but the Ultramarines surpass some peers in other areas.

Therefore I have trouble seeing him and his Astartes as being the best at anything, but they're not the worst at anything either.