Valdes is part of our lineup, it's his job to make saves, so him doing it shouldn't be a surprise. We also had more attempts on goal than Madrid did, so it's not like we couldn't have scored more either.
A trophy is a trophy. I would have liked to blow them out each game too, but I'll take the supercup even if we only won on away goals. And Atletico are a great team, there's no side in the world should be ashamed of drawing them.
I consider a lack of failure a success, not an ultimate success but certainly a success nonetheless (aww yeah that rhyming), especially considering how we ended last season and how Messi was injured for quite a while. Not to mention I was more addressing your point about staying competitive; we've done pretty much everything expected of us, there's not much more competitive we could be.
I think Rafinha, Deulofeu, and our upcoming players from La Masia like Denis Suarez, Dongou, Samper, Bagnack, and Grimaldo are more than enough for our future. We do need to sign a new CB, someone experienced for depth to cover until Bartra and Bagnack reach higher levels, and we should look at scouting a fullback, although I think it's too early to get rid of Dani. Also it wouldn't hurt to ask for a CM, again someone more experienced that can help cover for Xavi and cover that intermediate period while our youngsters develop. But that's not really an urgent need, or even a need at all, I think Rafinha can play games in midfield next season, maybe have Cesc or Iniesta play the more defensive role and let Rafinha go up when we rest Xavi. And I haven't given up on Roberto or Song yet, just look at Alexis, it took him until this season to truly reach a high level, I see no reason why Song would be different.