The video demonstrates the Wii U version, and it doesn't look that good at all. Did you happen to play DQ8? It had some of the best aesthetics on the PS2 hands down. What was being shown on the Wii U doesn't even really look like much of a step up from that graphically.
It's also pretty sad that it's an MMORPG now. Yay, now I need to rely on waiting around for other people to continue. People that may, or may not be up to speed and not drunk or whatever.
People have beaten the entire game solo. It's more of a challenge, but definitely in the doable range.
At this point the final boss is a cakewalk if you got a couple key skills.