Errr, 3/10 is a bit low. A 5/10 would be more appropriate, with 6-7/10 being a generous score for people who enjoy grindfests.
I cannot deny that the animation quality and loading screens are atrocious, but I can't see how the balance is "off the rails". You claim to have played 30 hours of this, yet I'm befuddled as to how you thought the story missions were consistently easy unless you managed to spend a ton of time grinding before each story mission - I personally spent a ton of time failing them before suspending the attempts and running off to grind a bit.
...but yeah, Sexy Time is a joke. It's at once too risque to actively feature or recommend to others, yet completely fails to be sexy due to severe Uncanny Valley issues.
That aside...this sort of single-to-multi-and-back-again system isn't really MMO at all...but I'm also someone who believes that WoW stopped being an MMO halfway through Wrath, and that GW2 is an abject failure of an MMO.
Thing is, the whole point of a persistent, populated world is to have random, meaningful player interactions. What I'm calling DME is closer to PvE automated matchmaking - you fight alongside these guys and then they vanish, never to be heard from again. Once in a blue moon you might make a friend, but most of it is going to just be passes in the dark.
I feel that 3D as a whole is really overrated for gaming, as anybody who plays games often enough will have learned how to perceive depth from a 2D image. Having said that, I also feel that gaming is what will be the decisive factor in the sales and promotion of 3D, as unlike film you don't need to double render times or obtain millions of dollars of studio equipment. With gaming, the development process has almost no change (just optimizing a 3D render engine really) and the user-side changes are no different from film 3D. So, 3DS, will it be worth it? I'm guessing it'll sell really well since it IS the Nintendo handheld, but I don't think we'll get games that actually take advantage of 3D for at least another two years...if at all. I'm sorry, but I really don't think a 3D gimmick makes a serious difference to gaming, especially considering how several games were built around being 2D (eg: most fighters).
Vsin's comments