I disagree in part, unless those plains are delaminating?
Apart from the unsightly ripped tarred building paper, it looks healthy enough from what I can see. There is a chance that ferrous fixings were used for the battens and (if any) for the tiles. If that is the case, then it could do with a re-roof.
The ex-con tile gapping on the verge is a normal sight for unfixed or unrestrained tiles.
The missing R/H corner tile (hanging) could be repaired with some cleverly shaped lead.