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Note - missions scale to the team size. There is sometimes a delay in when the mob sizes scale up to a new size team....
Ah - and as for the argument that mission XP "sucks." Yes, you do reap less XP/minute if you simply travel from your contact immediately to your mission door (which tends to be player behavior). However, if you fight some spawns on the way - and finish the mission with the new XP rewards - I think you'll find that missions are much, much more competitive XP wise.
Oh - and one other thing. The vast, vast majority of players at any given time are on missions. XP or not - it's the most popular part of the game.
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I have a suggestion just for missions that I hope you'll consider. Right now my regular group consists of 2 level 38 guys, a level 37, a 36 and me, a level 33. When we do missions we only want the level 38 guys to get them because we're hoping for harder villians to fight. However, even some of their missions lead to villians that are to low and to few to offer us a challenge. It would be nice if everyone in our group could get a mission that would be challenging.
So my proposal, which I like to think is simple..and simple is good. For missions please grab the highest level guy in the group. So in our group that would be 38 and add 2. Make all of the villians in the mission level 39 - 41. Scale the size based on how many people we have in there. I've played with a point system. So minions are 1, lts. 2, and bosses count 3. For each hero you want a score of 3. So if we had 4 heros you'd want villian groups worth 12 points. So in this theoretical mission we could run across group of 12 minions level 39-41. Or even 4 bosses level 39-41. Or a mixture...say 2 bosses, 1 lts, and 3 minions all level 39-41.
I believe this would make the missions hard and the xp would be great. Well maybe not great, but good! Also with tough groups like this I think the other archtypes would be needed more. I'd want a tank along, a controller, a defender, and definitely some firepower.
I haven't completely thought this through to the point where I've considered every level range and every group size. Again though I think is a fairly simple algorithm for mission composition that would make for a more challenging game and better xp in missions. It would also allow everyone in the group to get a mission instead of just the higher level guys.