get an engi, build a side path, buff your weapons, plant a turret
operatives flank, stick the enemy, or just go and do the objective on their own.
In short, the game is attempting to balance in such a way that spamming one or two classes wont win it for you.
Well, I guess that would work....
It's a bridge over water. You'd have to fight them and defeat them. Have you not seen that vid? Although it may not make it to final cut......
Yeah; Splash Damage used a lot of flanking paths in its map design in ET:QW (its last game), and characters that can climb walls will probably be able to circumvent choke points. Note that if the enemy is all Soldiers and Medics, they have no Operatives, which means no radar, which means you can often surprise them.
I would also submit that there appears to be an incendiary grenade that should clear out that choke point pretty quickly, if you want to go for the more direct route. Splash Damage's previous games had a class that could call in fire support to temporarily deny an area to the enemy, and although there isn't artillery in Brink, I think the devs have just moved the "temporary area denial" concept over to special grenades.
You need Operatives to have the motion sensor/radar? Lame.....