I haven't seen that many Olive releases, but I quite like the ones I have seen. They look very much like watching a freshly struck 35mm print. To me, that's the ultimate goal of home theatre - to feel like I'm watching the film on opening night in a good theatre.
There are many highly-lauded blu-rays that look too clean and scrubbed. Jaws, for example, looks very good, but really looks nothing like it did in 35mm prints.
Please, don't misrepresent my comments as to not liking Olive releases. Unlike you, I have seen many of the Olive BD releases as I've got 100 of their BD titles in my film library and will have several more by the end of this month.