So I was browsing the forum, and people are throwing out their ideas for what EC should do. Well, that's all well and good, but what about things EC should NOT do? What are the mistakes from other MMOs that should be avoided to ensure a successful Warhammer 40k game? I feel what brings down a lot of games are the things they implement that would have been better left in the planning stages. Some ideas look good on paper, but when it comes to launch, it turns out it helped destroy the game itself.

The one thing I think Eternal Crusade should avoid doing is having instanced battlegrounds. This separates the player base from the active war zones. Warhammer Online did this, and I feel it was a major contributing factor for the empty RVR lakes that plagued tiers 2 and 3. Because of this, it turned Tiers 2 and 3 into PVE fests.

planetside 2 did this somewhat right IMO--you were able to just travel wherever you wanted, which adds the free-roam element of MMO's...

Avoid going from an MMO to a single / coop / multiplayer game.

don't launch the game until it is ready

Giving Boltgun's empty cases. A bolt being a type of ammunition that consists of the entire projectile and leaves nothing behind. Though technically they are RPGs.
They should also avoid making the red ones the same speed as everything else.

There are 2 repeating mistakes that I saw happening with other MMO's in the past:

1) Don't raise false hopes...the dev's should be straightforward and talk about the things they can do or have already done, not throw ideas around that, as history shows, people will most of the times never see in the game...

2)This is actually a "do": DO use the beta testers properly, let them test...beta testers are there to test, not to underground advertise a game,rewarded with some free play time...they are there to test the game devs make, not only stress test, or "focus test" just to hide the true state of a game from them.People are not idiots, they see these tricks a mile away, if they are actually there to test, and not just for the free play time...

That's a good start, I'm sure people will cover a lot more specific "don't" advices.

High prices in the cash shop, i won't buy any skin for 10$, i will buy 10 for 3$ each.

Aye - and they should avoid having a paid access to a long period of 'beta' testing.

First up it makes a mockery of Beta testing and let's face it everyone knows that it's just a cynical attempt to get players to pay more for an early access.

Avoid listening whiner and cryer.

...except when they're right.