ok so its generally known you should be a worker to start the match, along with holding capture points.  
once classes start being upgraded.... wut in ur opinion should be the order...  or at least first, second, third... 
personally i think... 
 
1 .  Worker ... because he needs the ungrade for ranged attacks..  also he should be rewarded for maintaining the resourses.. 
  
2. Priest... ahead of any other offensive class to be upgraded simple because he has no offence wutsoever.. aswell as a superb upgrade... dark priest helps a lot to turn the tide...
 
3. Mage... probably the most usefull area charge in the game.. Ice charge is quite simply "the shit"... and is absolutely needed to win a match... 
 
 ... diagree ? ... reply!  tell me wut u think is a more important class to be upgraded...

I really think the archer is a great class to upgrade. The shotgun you get is great for getting the first hit on an enemey then all you have to do is switch to the bow real fast and rapid fire until they are dead. Also I great defenceive class to use just to protect your castle doors from being destroyed.

" I really think the archer is a great class to upgrade. The shotgun you get is great for getting the first hit on an enemey then all you have to do is switch to the bow real fast and rapid fire until they are dead. Also I great defenceive class to use just to protect your castle doors from being destroyed. "

Here's what you do, at the start everyone just rushes the other base, as a villager, and gets the princess. Done.

I always go for Worker first. His small bomb is good for groups and the big bomb is fucking deadly. Then Ranger because I love his shotgun. Then Priest so people won't bitch about being the Priest.