Right, after playing this on gameday, my initial impression is that only one of the three pathways from spawn is generally worth taking:
The blue pathway, on the ground level, is the worst. It takes you right out to the courtyard at the front. The green pathway is not much better; it leads there also, and has a natural height advantage all the way, but still leads there.
The courtyard is problematic, because the only way from it to the point--except for rocket/sticky jumping--is through the front door, which is a narrow bottleneck that's also highly exposed: it has no cover nearby.
The purple path (or the green path jumping off at the first arrow shown) is the best by far: it doesn't take you near enemy fire, and gives quick access to the upper floor--probably the best way to assault the point, given the height advantage--and to the sewers. The sewers are the second-best way onto the point, as they have the cover of the bar, and a quick retreat down the ramp into cover and towards health/ammo.
So the purple path is almost always the best way in.