Wow, amazing season premiere. As Whiskey Tango said, it's the best start we've had to a season since season 1. I just hope they keep this up with the rest of the season.
Season 1, despite being very short, has been the best season as it gave with each episode and never dragged on. Season 2 was good, even if the first half was a little slow. Season 3 has been the worst one imo, even though the Governor was great. Season 4 redeemed season 3 with the first half of its season but it all died down in the final half of the season.
I'm glad to see that Season 5 has given us an 'explosive' intro and like I said, I just want them to keep that up. I like how quickly they wrapped up with Terminus, I liked the tender moments between Daryl and Carol and Rick and Carl seeing Judith again and I liked the brutalness in the first few minutes as the throats were slit open (though that was really unexpected).
They need to keep giving with each episode because if the momentum dies down again then it's just going to get disappointing and the show is just going to offer these great episodes every now and again. I'm not saying every episode should have the amount of action that the season premiere did but they definitely need to tell some good stories and flesh out characters more (especially Glenn who hasn't had a lot to do these past couple of seasons).