5/5 How Can You Not...
  by Book Lover (Texas)
Love ER? I haven't received it yet, but of course I've seen every episode.

The holder for the DVDs is well made and stores the DVDs well.

4/5 It's ER!
  by laball (Albuquerque, NM United States)
Not as good as some of the earlier ones - but still a good ER run.

3/5 My Least Favorite Season
  by Nathan B. Blake (Kirkland, IL USA)
ER had some ups and downs it's last five seasons, and this was the lowest point. Why? I can sum 90% of it up in one word: Africa.

After leaving the show in the season 11 finale, it was announced that Noah Wyle would return for several episodes in season 12. That sounded great...at first.
Then the episodes aired, and it was more of Dr. Carter in Africa. The writer's already made their points with this storyline in season 10. The Africa episodes in season 12 simply don't add anything to the story, and are just more of the same.
Granted, none of these Africa episodes are as bad as "Makemba" from season ten, but
they still consume too much of season 12.

And now for the other 10% of the problems.

There is an episode in the first half of the season callled "dream House", and it is probobly the worst non-Africa episode of the series. It focuses on Abby and Neela treating a baby Monkey. There were other occasions where animals were treated in the ER, but this case takes up too much time and lacks effective exectution.
Also, the season premiere was weak.

Now, for what I did like:

Kristen Johnston (I'm not sure if I got her name right) and John Leguizamo all have good recurring roles, and James Woods is excellent in an episode where he plays
a former teacher of Abby's, who has ALS. Woods received a well deserved emmy nomination for this role.

There is an excellent storyline where Kovac treats a woman who emerges from a coma after several years, and on a personal note he and Abby's relationship was rekindled.

There are some other good patient storylines (an Islamic girl is the victim of an honor killing, a child used as a human shield by her abductor, etc) and Scott Grimes becomes a regular cast member, which I wasn't happy about at first, but starting with the season finale and continuing through the remainder of the series, Dr. Archie Morris became (in my opinion) one of the best charachters of the series.

One last thing I want to discuss is the season finale, 21 Guns. This is a polarizing episode among ER fans. It caused many to tune out for good, while causing others to wait at the edge of their seat for the season 13 premiere. I was somewhere in the middle. After twelve seasons, the show had already done so much gunplay in the hospital that this finale pushed believeability. However, it was an intense way of pushing some tired old storylines out of the way (Sam's ex-boyfriend) while paving the way for a strong start to season 13 (and some fresh storylines) I personally believe in it's fifteen years on the airway, ER did stretch believeability when it came to gunfights in the hospital, but compared to some other popular shows, I don't think this was even close to the worse
case of stretching reality (24's Jack Bauer couldn't possibly survive everything the writer's have thrown at him, and Meredith on Grey's Anatomy would've died in the Ferry accident episode (and no, I don't watch Grey's Anatomy).

I will definately be adding season 12 to my collection, but I see much of it as merely a bridge to better seasons.