I'm sorry but Rocksmith isn't teaching you how to play bass and it's not teaching you music either. Its teaching you how to play songs and I'm not even sure if it's doing that much. If that's all you want to do then fine it's working for you but don't confuse the two.
There are tons of great learning resources on YouTube for you to use. I really feel those 80 bucks could have been spent on a couple lessons to make sure your form and posture and right hand technique aren't going to be causing you problems later on
Eh, I picked up a copy when it came out to see what it was like. It was so clunky that I shelved the game. Pulled it out a few days ago, patched it (which fixed the clunkiness), saw there was a bass pack and downloaded that to check out.
First, as an out-of-practice bass player who already knows how to play the instrument, the game is downright fun. it would get a noobie's hands and muscle memory into shape pretty quickly, it vaguely explains different techniques, and has mini games that develop important skills like changing positions on the fly, etc. Semi-tight timing is important if you want to score well, but the game doesn't really emphasize how to just listen for the groove. I think a lot of people who play rhythm games focus on the visual cues instead, much to their own musical detriment.
You're not going to get the theory explanations of key signatures, chord-building, and whatever else you'd get with a teacher (well, the average guy teaching at the local shop probably wouldn't provide that to a new player either), but if you're a new musician, you'll certainly get a chance to develop a musical ear, in both the song mode and mini games you have to listen to whether the notes your playing fit musically with what's going on.
Finally, the game is automatically adaptive to how well you're playing a song. You start off plucking some whole note roots, soon you're fleshing out the actual sound of the song, by the end you're paying attention to all the cool syncopated and swung notes and throwing in some pretty quick runs up and down the neck. I think that's a great way to start learning how to learn music. When you play a video game, you solve problems through trial and error, then move on to more complicated problems and repeat. This is also how we learn new songs that are a bit tough to just sit back and sight read. Rocksmith seems to combine the two well.
I don't think it's any kind of replacement for a good teacher period. I don't think it's a replacement for a bad teacher when it comes to thinking about theory and musicality, or scrutinizing technique. I do think it's a lot better than just picking up tabs and trying to teach yourself. You're right there are great youtube videos out there, but there are 10 times as many bad ones and new players might have trouble discerning one from the other. Perhaps the new-gen game consoles, with their ability to switch apps on the fly, can combine games like this with instant links to videos of good instructors covering the basics and pages of tablature or standard notation for players to grab on their own.
This game is a good thing if it gets some people over the first hurdle to learning guitar/bass; it's about as well-executed as a first attempt at this kind of thing could be. I really hope it gets better and becomes a more useful learning tool to supplement others. I just ordered the 2014 edition which is supposed to be a major overhaul instead of an update. I'll share my impression on that once I get a few weeks of playing in.