I liked it, it was just mindless fun. And since Top Gear was out of the air for so long, it was like a junkie's fix.
Yes, the explosions and stuff were silly, but I laughed at some stuff like driving with all our glasses blacked out, cos GPSs do this annoying thing which is turn into roads they expect you to turn into, rather than give you your actual position.
The demolition derby MOT with weapons was stupidly fun, reminded me of Battle Bots or something like that.
And I guess Jeremy died in the apocalypse... it'd been fun if he made an appearance like a zombie which Hammond or May ran over or shot, to finally get back at him.
PS After reading some comments:
You people need to start relaxing and having a laugh. I'm not saying you should like everything Top Gear makes, but honestly, saying "it's the worst thing I've ever seen", is a bit over the top. Either you haven't seen anything at all ever, or you need to take a chill pill and have a bit of fun once in a while. While reading some of your comments, I couldn't help picturing you writing them: