I visited this tWHS in spring 2022 en route to Butrint from Durres. It is indeed a very big area and if you walk to all the different components of this tWHS a visit can easily take half a day. If you're pressed for time most of the highlights are close to the entrance and a quick visit to the neat museum can suffice.
Like Stanislaw I was mostly surprised by the national importance attached to this site known also as Ilyria and to the Ilyrians in general throughout Albania. It has the same scale as some of the best ancient Greek sites in Greece and Turkey and likewise is full of endangered Hermann’s tortoises and snakes so stay away from overgrown areas. Other than that if you enjoy ruins, this is definitely one of the best places Albania has to offer together with Butrint and also a great place to hike from one bunker to the next. The highlights not to be missed in my opinion are the museum itself (St. Mary's Church) where more excavations are currently taking place just in front of it, the six columned monument to Agonothetes built in the 2nd century BC, the odeon and the nymphaeum.
Unfortunately, some of the problems mentioned by Solivagant are still true and the site still doesn't have sufficient protection. During the COVID-19 lockdown in June 2020, part of the site was vandalized. Two columns were knocked down, resulting in the almost complete collapse of the Nymphaeum. During my visit, some locals seem to still randomly use the offroad path which leads to the nymphaeum as an irresponsible shortcut to drive on to their home or fields with little respect to preserving the site's biodiversity or history. Also there is no proper parking lot for the time being. Hopefully things will change for the better, with or without inscription as it clearly is one of the country's best historical sites.