I think if you're not interested in ESPN+ then it's less expensive to get Hulu separately than to get the bundle with everything, but that's only if you take advantage of one of the pre-paid Disney+ offers. Otherwise it's less expensive to get the bundle with everything. For example, I will be getting Disney+ for $4.72 a month with the discount offer. If I add Hulu for $5.99 a month that totals roughly $10.71 for both. If I get the bundle including ESPN+ It's $12.99 a month, which is only $2+ extra a month. It's not a whole lot more, but for something I won't use, I'd rather skip it. Not to mention, me getting Hulu isn't a lock. I have never subscribed and I'm only casually interested in some of their original programming. So I may not even add it at all, which would save me an extra $6 a month. I already pay for Netflix and I have Amazon Prime. Amazon's programming is just a bonus for me though because I mainly pay for Prime to save on shipping throughout the year, as we shop quite a bit on Amazon. So for me I almost consider the Amazon programming as "free".
As far as the content available at launch, between myself, my wife and my kids there's more than enough we are interested in watching at launch. I don't mind them rolling things out slowly. My #1 interest for Disney+ is Star Wars, followed by Marvel, Pixar and Disney in general. Can't wait to dig in to so many things I haven't seen in a while!