I agree with you on the Evo 4G -- and honestly, in my opinion, on the basis of so many positive reviews at the time, the Evo probably got a lot more credit than it deserved. At its release in June 2010, it had a Snapdragon processor already found in devices released half a year earlier in the Nexus One and HTC Incredible; the 8MP/720p camera was great from a stat comparison point of view but otherwise was pretty mediocre as a camera in lowlight and the video/audio was terrible; and it would take nearly half a year later for 4G to come to the largest city in the United States, New York City.
In that light, it'll be interesting to see though, how the lukewarm reviews will impact how the Evo 3D will be remembered in history.
You know... I don't recall that the reviews for the Evo 4G were terribly glowing. The battery life on 4G was blasted and battery life overall was just passable, the size was questioned and the speed was deemed acceptable but not as fast as other 1Ghz snapdragon phones. I think a lot of what made the Evo 4G so good is that sprint/HTC worked on fixing the issues... lifting the 30fps cap, gradually improving battery life, addressing some of the build quality issues, etc..
I only hope they give as much post-release attention to the E3D.