If raids are done correctly DE can take Warframe from 7.5/10 to 11!
But it's no small undertaking - it requires a lot of skill, time and effort.
Personally I would consider it as some of the best kind of endgame imaginable.
I used to run countless of raids in Star Wars: The Old Republic as a Guild Master or just with completely random players.
It keeps players engaged by doing the daily or weekly raids with their guild members and it evolves their skill set and play style.
Tactics are explained at each boss fight for newbies - but it's still expected that the raid group will wipe again and again - as it's just a natural part of the learning curve.
The 8 or 16 man raid group consists of Tanks, Healers and Damage dealers.
Tanks keeps the boss focused on them and takes the blunt of the force - healers heals the team and damage dealers dps burn the boss.
The group must kill the boss before the enrage timer runs out - or it will deal massive damage killing the team.
There are usually around 4 bosses in one raid and it usually takes more than one hour to complete it.
There are 3 types of raids with 3 levels of difficulty with somewhat changed mechanics.
The easiest are story mode raids where most of the players can complete it without any problems.
The next difficulty is called hard mode raids where most of the players will struggle to complete it.
The highest difficulty is called nightmare mode raids where even the best raid players will get killed by making the smallest mistake, but it's still doable.
How to make Warframe raids a real success?
The raids must come with some epic story and epic scenery combined with some epic cinematic cutscenes, plus the epic boss fights must be fun and challenging to do. The loot must be so awesome - that it's still worth doing after your 50th time - and teaming up for a raid group must be quick and smooth. The raids should come with different levels of difficulty and technically be close to bug free with stable connections and acceptable fps. It's not a small undertaking, but it's very much worth it - if DE proves successful.