Actually, with the extra +1's, you save points in those scores with point-buy and can use the extra "point-buy" points for a pretty good third score. For example:
Human with point-buy:
16
16
14
11
10
10
Human variant with point-buy:
16
16
11 (maybe 12 with +1 from half-feat?)
10
10
10
The difference between a 14 and 11 is pretty significant, and at the very least will probably help DEX OR CON. Ranged warriors (archers, rogues, etc.) are the only ones I can think of who possibly won't benefit from a 3rd good score.
You also have the minor bump of 11 over 10, which with a half-feat later on could bump the 11 to 12. shrug
Now, if your variant human's feat is a half-feat, you could add another +1 for the half-feat, but you would still be 2 points of total attributes short of the base human.
If you roll scores, however, odds are many of those extra +1's won't be much good. Also, with standard array the base human is pretty weak.