This is, of course, an abridged collection. As such, we are forced to rely on the opinion of another. Granted this is common enough with poetry collections, but that doesn't change the very nature of each person having differing interests. There is no way to know if the ones he leaves out are just as good or even better, from each individuals perspective, without going to more comprehensive texts.
Regardless, I do have one gripe with this book that is unrelated to the above pettiness. The method of dating each poem seems silly to me. The reason is that they are all claimed to be from one of several (if memory serves 3) years separated out over several decades. That and there are two listings of dates for each poem, which I don't recall off hand why they did that, and it may serve some purpose, but it's not useful information if when these poems were written can only be pinned down to plus or minus five-ten years. I can't blame Johnson for this as I imagine that is as close as is known, but, by the same token, the dates could have been left out so that it doesn't detract from the actual poetry.
All in all I would recomend this book, but I might suggest getting a more complete version instead (so long as it is unedited--Emily hated it when people wanted to edit her poems, and I think that we should respect that).