DC has never quite had the same success with team comics that Marvel has. Marvel has the Fantastic Four, Avengers and X-Men, all of which have been running more-or-less continuously for five decades (except for an early '70s hiatus for X-Men). DC has the Justice League - which has had its gaps - and to a lesser extent, the Teen Titans and Justice Society, but none have really had the runs that Marvel's team comics have had. Among DC's lesser (in terms of ongoing success) comics are the Outsiders, Challengers of the Unknown, Metal Men and - the topic of this review - The Doom Patrol.
The Doom Patrol consisted of three superheroes: Robotman (human brain in a robot body), Negative Man (who could project an energy being from his body) and Elasti-Girl who could grow or shrink as needed (mostly growing). Leading them was the Chief, a super-genius in a wheelchair, and occasionally assisting them were Mento (a telekinetic who was also Elasti-Girl's boyfriend/spouse) and Beast Boy (a green teenage who could take the form of various animals).
Volume 2 of the "Showcase Presents" series has issues 102 to 121, the last of the original series. In these issues, the Doom Patrol takes on various strange villains but their archenemies are the Brotherhood of Evil who seem to appear in around half the issues. There are also backup stories providing backgrounds for Robot Man, Negative Man and Beast Boy.
As anyone familiar with comics history knows, a pivotal change in the industry occurred with the 1961 appearance of the Fantastic Four. This and the other Stan Lee/Jack Kirby and company creations at Marvel brought a new level of storytelling and characterization that DC would take a long time to catch up to. These Doom Patrol stories appeared in the late 1960s and show DCs gradual adaptation to the new comics world. There are some character development and multi-issue story arcs which show some growth in DC's writing from the simple kiddie fare of earlier days. On the other hand, the writing is still rather simplistic and the characters not all that interesting.
In short, this is not the DC has to offer. It's not awful, and credit should be given to DC for at least starting to evolve, but in general, this Showcase edition (which I'd rate a low three stars) is perfectly okay to skip.