The main problem is that unlike in PR, you can deploy a spawn beacon without people near you. Which means that on Mos Espa, a single Squad Leader can easily fly past the Rebel lines, drop a spawn beacon and have a whole squad spawn behind the enemy.
Flying speeder bikes can be extremely annoying, yes. The trick, however, is to adapt the maps and CPs to them, as was done on Endor Strike Team where we added turrets to blast the Heck out of whoever tried to land atop the Imperial Outpost. Though... that map should still have a hill or tower or whatever some distance behind the IO CP so that you get a chance to shoot at people atop the IO.
"One of the bitches actually gave birth while she was attacking, and her puppies joined in on the carnage."
--the awesomeness that is Boatmurdered.