I don't think there's anything nostalgic about it, at least as far as I'm concerned, not enough time has passed. Personally, I didn't have high hopes at all, despite having the utmost regard for Gilligan (I once sent him a spec script, he obviously treated it with the respect it deserved). Breaking Bad was a behemoth and I thought Better Call Saul was perhaps too soon, but it's very much it's own thing. Its tonally different, it doesn't seem as focused and Saul (James) is a much more defined character than he was in Breaking Bad.
If Breaking Bad didn't exist this would stand on it's own, at least based on the first two episodes.
I liked Breaking Bad, I didn't love it. I actually think the first two episodes of this are stronger than the first two of BB.