pb variations
"But is the point buy in the DMG the best way to go?"
Probably not, and if the design job was done properly, it definitely is not.
A premise of 3e design is that 10+18 = 14+14. That is. If you increase any stat, you gain a net zero because you weaken another and the character remains at the same strength. Now, perfection is not to be expected in a mortal world, and 3e shows several acknowledgements that they knew they did not fully succeed. Thus the half-orc's increase in strength is balance by losses in 2 stats instead of one. And very high stats are made harder to get even tho they should be of no special benefit.
Still, it is quite possible to argue the higher stats are well overpriced and the strongest PC has no stat above 14 [or 16 for non humans]