The word "determinism" is actually a bit overloaded. In a mathematical sense, it simply means "devoid of randomness", in a philosophical sense it means "external to (human) will", and to muddy things even further there's the completely separate concept of deterministic and nondeterministic computers/algorithms (which do not actually imply non-determinism in a mathematical sense).
As far as mathematical determinism, it probably is (is my strictly intuitive guess). We model quantum things as probability distributions, but probability distributions don't actually require true randomness as any computer simulation involving pseudorandom number generators will demonstrate. It is perfectly possible that they are caused by patterns independent of higher observable factors.
As far as philosophical determinism, well it all depends on how you define "will." Personally, I don't see the concept of human force of will and individualism as being incongruous with physical reductionism. Saying "the universe you told to do this" isn't going to change the human engine from shaping the Earth based on our higher and lower egos.
