It's not on the level of Klopp's Champions League and Premier League-winning teams, but that was always going to be impossible. Jurgen left behind a very good squad, but not one that was at its absolute peak, and certainly not without its flaws.
There was work to do on the first team, aside from the ongoing contract issues. The Nunez deal looks like a failure by most reasonable measures, the left-wing position wasn't providing enough productivity, the six role was filled by a stopgap signing (though a good one), and both Gomez and the left-back position needed attention. Key players like Robbo, VVD, and Salah have all aged by around 3-4 years.
Slot has managed to make Grav arguably as impactful as Fabinho, but even with Gakpo's improvements and Diaz's efforts, they’re still no Mane. As for Jota and Nunez, why bother even comparing them to Bobby. The reality is that in peak Premier League years, this squad would likely be fighting for third or fourth place, but we should acknowledge that the level of Klopp and Pep's teams during their best years were anomalies. I believe that on form the current squad would stand up to most title winners in history.