Here's another example where a British speaker would be likely to understate how strongly s/he felt, in order to avoid offending anyone.
You happen to have struck up a relationship with a third person ~ about whom the person you are speaking to right now has doubts, on the basis of previous experience. You want an honest opinion, but Person 2 is trying to warn you off Person 3 without being rude. Person 2 offers the softest possible of these 4 comments (and therefore, probably, the least helpful to you!); which one?
'I wouldn't recommend you to spend too much time with him. From what I gather, people find him ...
... a little strange.'
... rather peculiar.'
... noticeably weird.'
... dreadfully odd.'