After watching the original series, I wasn't really satisfied with the ending at all.
I understand that Redial is just pure fanservice for those who weren't really satisfied, but in a lot of cases it didn't really work out very well, they added beach scenes which weren't really needed.
I didn't find and of the humor really funny in the first half of Redial and it didn't feel necessary, since the original series was never really meant to be funny at all so the humour used felt misplaced. Also characterization in the original series wasn't the best, especially in terms of side characters so the humorous moments didn't feel humorous.
Where Redial really starts to redeem its boring first half is the last ten minutes of the OVA when the focus is shifted to Yuno and when she starts to remember what happened in the original events of the series.
In Conclusion, the first half of Redial is just fanservice and a bit boring and rather mediocre, while the second half is better, but that doesn't mean that your time wasn't wasted watching the first half of the OVA.
