Yea, leading up to the game I was watching a bunch of videos from the beta, and I was sorely disappointed when I got my hands on the game and SUCKED. I do like watching them though, but I did kind of burn myself out on watching in the month leading up to release. I do find that they help quite a bit for learning builds, I got pretty good at Marine/Tank, MMM, and Marine/Thor as straight up builds, along with just generally knowing when to transition and stuff, through watching videos. Got to the Platinum League pretty much solely on MMM (don't hate).
My one gripe about SC2 is that you really need to play a lot to keep up your level of play, which isn't really a complaint so much as me just being pissed after taking a break haha. I played pretty much every day for about a month and a half, and then college started and I stopped playing for about 2 months. When I tried to return, I found myself playing in Platinum still, but I just got dominated over and over because I was so out of practice, and there was no other option other than finding someone to play with. I guess its also because I didn't play long enough in the first place to really get it ingrained enough to be able to take a two month break, but it pretty much made it so that I dont play the game any more even though I love it. I'll probably try another return sometime soon, but right now I've been enjoying League of Legends.