Not only to do you start in a place that is highly exposed, but also it cannot be reached quickly after you leave it. Once you leave the walled platform to the lower city, the city across the river, or in the river, you only really have one option to get back up near the suspension bridge. Making it nearly impossible to stop a fast-cap by lights with jump jets if you have already left it.
Not only that, but the terrain you leave your base for is highly unfavorable as well. You have to march towards the enemy position with no sight-lines, and no oppurtunity to turn back to base.
The other side, on the other hand, has the advantage of starting at a lower position, the ability to look right at the enemy's base/lanes, and can always turn back and easily get to their base to defend.
TLDR: If you start in the exposed/walled up dropship area of river city, you're gonna have a bad time.
Edited by Garfuncle, 17 February 2013 - 08:21 PM.