Why does Kalos Route 1 get hate but not Seabreak Path?
Seabreak Path only exists to show off the graphical capabilities of the DS, just like Route 1 was meant to show off the 3DS.
"It is, however, the longest route in any core series game. With a length of about 256 units and 8 blocks on the Town Map, it would be impossible for a game from Generation III or before to support this path without dividing it into several segments. Once unlocked, it can be popular among players for Egg hatching."
Route 1 also has its own distinct theme whereas Seabreak Path just reuses the Floaroma theme.
https://www.youtube.com/watch?v=WNuW1B2MWp0