Based on watching him at Liverpool and Southampton I would say his performance levels are right up there with the best PL defenders I’ve seen. Obviously you could argue that a true “great” should have medals to prove it. To me that’s irrelevant to how good an individual actually is (e.g. Matt Le Tiss) but it’s a fair point.
The only other criticism you could aim his direction would be whether he can sustain these levels, long term, but this his fifth PL season and he’s been a model of consistency so far, so there’s no reason to assume he’ll get worse from here. Taking his age into account, there’s a good chance he’ll get better.