The current gen is one of the weakest crops of players, not even being able to win one slam against the geriatric Big 3. Embarrassing.Because low-ranked players were consistently reaching higher stages of grand slams. If Federer wasn't around to win slams, they could've been won by literally anyone (e.g. Philippoussis)
Current era is not weak by any means; Medvedev, Tsitsipas, Thiem, Zverev have won great titles (except GS) and more or less consistently reach higher stages of GS tournaments. People say they're weak just because they haven't been winning grand slams, but that's fallacious logic. They haven't won slams because they had to consistently play against two of the three GOAT players still playing at a crazy high level.
I would even argue that current next gen is at least as good as Delpo and Wawrinka were in the last decade