Video cameras have EVFs because they have to, and they all stink. Even some users of RED's nearly $4000 EVF have demanded a non-TTL OVF because the EVF isn't suitable to their uses.It would be interesting to hear the pros and cons from those folks.
The red is a specific device, which has great hype, but not always great user experiences. Some would have it that the phrase 'EPIC FAIL' comes from Red One users experiencing frequent lock ups.
I would need to see what specific beef the Red users have and in relation to what model before knowing for sure, Red have launched their new wide DR sensor, the Dragon, and it's unlikely anything outside of studio reference quality monitors would do the images justice.
I wouldn't confuse the experiences of Red users as being something that relates to users of all, or indeed any other video camera.
One thing to remember is that video is fundamentally different to stills, even although they can be captured on a DSLR or mirrorless these days.
Video is contiguous. Each recorded frame (and therefore each monitored frame) has to be accurate. Video guys don't get to pick out the best frame from their 25fps. Each frame has to be usable.
Also, generally speaking video guys wouldn't change things like focus, aperture or shutter frame to frame, again as it's contiguous, manual exposure is the order of the day, pre-focusing, clickless aperture stepping... all video things that stills guys might not get.
Basically, to compare the experience of a cinema camera user like those of the RED cameras, to folks shooting stills on an OM-D isn't that valid. The principles, expectations and requirements are entirely different.