It's not what we would have expected from a professional service.
It's not what I expected from a professional service.
Do they mean almost the same?
You changed "we" to "I" for no apparent reason. It would make more sense to compare these: It's not what we would have expected from a professional service. It's not what we expected from a professional service.
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You changed "we" to "I" for no apparent reason. It would make more sense to compare these:
It's not what we would have expected from a professional service.
It's not what we expected from a professional service.
They mean roughly the same, but the second one is a bit more direct.