I've enjoyed it since the very start. I watch it because they just do and say dumb shit and it's great for a laugh. The whole concept of the show is a little silly, but if you just focus on that then you're never gonna enjoy it.
I never expected the show to change very much over the seasons, I mean why should it? It has been a big success and making major changes to it just wouldn't be right and it'd likely ruin it just for the sake of keeping it fresh. I hate when shows do that, especially since your average person can't bare to watch 2 or 3 seasons of the same concept but just at different locations. I know I can.
I'm still looking forward to this season, especially considering it might be the last one. The first season in New Jersey was great because it was when we became aware of the show and the location it's based around. The second in Miami was kinda average and I didn't enjoy it very much as it just wasn't the same. The third season, this time back in New Jersey, was better than season two but the main thing that held this one back was the entire season basically being engulfed with Samme & Ronnie's immature bullshit.
Now as for last season in Italy, it was great to see them out of their comfort zone and in a new surrounding, which should set the fifth season up nicely as I expect the first few episodes to be them going nuts for tanning and clubbing and that.