I quite liked the Explorer for what it is!
My mum just got one free on a £10 a month contract with Orange, it's very small, light, the screen is decent enough, the rubberised back is a nice touch and the whole thing feels good in the hand, the camera is serviceable, it is being kept up to date Android wise (OTA version from HTC is inline with my SGS2) and (this bit surprised me) it is genuinely not slow in use, the screens relatively low resolution means the 600Mhz CPU genuinely keeps up with the UI, and I'm REALLY fussy when it comes to responsiveness.
Personally don't see the problem with it, it's a well packaged low end Android smartphone?