If you're interested, Yogi, (or just bored), there's a ton of sites with explanantions and theories about what happened. But, it seems as if everyone's own opinion is what really counts and that there is no solidified concensus on what went down in the diner.

i just looked at like he waqs having a meal with his family and life goes on

Cutting it off when they did to me lends perfectly the "in the moment", existentialist feeling throughout the last season, perhaps the entire show. It's one of the most truly episodic, fragmentary shows ever.

Good thing or bad thing?

Depends on what you like, I suppose. You can either look at it as lazy continuity, or making the most of the actual form - a television series. Chase and co. found it quite a challenge and a thrill to write individual, self-enclosed episodes and still do the overall arc thing. Some people, on the flip side, find it challenging but not thrilling to watch something so fragmented and lacking continuity. I accepted it after season 3, really.

The last episode was good except the ending, too abrupt, its like he forgot to finish the whole series.

i thought he ended the series well

I like it because you can either watch a random episode and not be lost or you can watch it in order and see the overall arc of the story.