Hampshire got lucky with the preparation of a poor pitch. If Notts had taken all the chances dropped - or half of them - on the first day, Hants could have been bowled out for under 150 and Notts gone on to decent 1st inns lead.
When you win the toss and bat because you think the pitch isn't good and won't get better, and get bowled out for 150 - and not because of especially bad batting, it isn't a good surface in my opinion.