I won't go into all the details of the reviews, but a general response seems to be that the film is good (cinematography, acting), but that there are a few pacing problems. Evidently there is some unevenness in the tone and direction, possibly making it a film that will lack broad appeal.
Without question I want any project that Meryl is in to be a success, but I'm not super invested in how well this movie does. No domestic distributor has picked it up yet, but someone eventually will and I'll no doubt be able to see it in October. Swank and Jones will be in the conversation for awards, but nothing I've read so far suggests that these are powerhouse performances. Regardless, it's nice to know that the film will overall likely be received reasonably well.