The only issue I have with the standard human is, since we use point-buy nearly all the time, is that most of my builds have 2-3 scores I want that are good, the rest I am happy with no bonus (but not a penalty, either, as I don't like dump stats in my builds). That basically means those +1 ASI in the 3-4 non-important scores really aren't that useful for me. At best, I can maybe finagle an addition +1 bonus to one of the important ones for me, which in the end means I am not getting a lot over what other races can get.
For example:
Here is a standard human array via point-buy to focus on a MAD character:
16, 16, 14, 11, 10, 10
Same concept but with a race gaining typical +2, +1 ASI's:
16, 16, 13, 10, 10, 10
What do I gain for the extra +3 ASI's? A 14 over a 13 (+1 bonus) and an 11 over a 10 (no effect).
Yet, the other race will gain all the other features as well...
A +1 ability modifier increase is not really worth all those other racial traits. If I play a race with 2x +2 ASI (like mountain dwarf), I lose even the +1 ability modifier increase!
So, IME, unless you are playing a very balanced character build where you want bonuses in most, if not all, of your ability scores, the standard human is very much sub-par when it comes to what you gain from it. To me, this is why the variant human is so popular over the standard one, because the feat and the skill really help balance things out compared to the other races.