I watched seasons 1 and 2 on DVD and saw season 3 on pirated video streams because season 3 was already over and the DVDs had not yet been released. So season 4 is the first one I've had to sit through commercials but I set up my DVR to pause for 20 minutes and then watch it while zipping through the clutter.
FWIW, I thought Season 1 was the best. I wanted a more reality-based tale that dealt more with surviving a plane crash instead of all this Twilight Zone stuff. It's still a great series but it just didn't go in the direction I was hoping for.