Engy, flamer and (i dont know the exact word in english) the GDI grenade guy (grenader ?) are very very efficient.
- First obviously they cost nothing So you can waste them at will on suicide mission.
- U can make a lot of damage (= score and money) with them on people, vehicle and buildings.
- And when u r killed the enemy's score increase only by 1 or 2 pts ...

I hate the 1000 bucks characters They re useful but not so powerfull and I love to kill them with 0 cost units. For instance I love to hunt the sidney (pic version) with a 0 cost flamer If sidney kill me, i don't care i just come back with another 0 cost flamer and soon my score increase by 100 !

On field, sometimes as GDI i use only the grenade guy and attack the airstrip during the whole game !!!! My money goes in vehicle for my team, i don't need it...
The Nod team is soon bored, because they there will be this foking grenade guy coming everytime... They place mines, sniper, laser chaingunner, MA, but lol the grenade guy is here again damaging the airstrip !!! So they try to convince me :"n00by when will u stop that ? When will u learn from that ? I killed u many times..."

"Yes u killed me many times, but look at the scores : my team wins."