OP, here is my 2 cents.
The game is much more tactical then 3e and requires group cooperation in a different way. Flanking, aiding, supportive powers, using the environment all matter in 4e more than 3e.
As another poster said, solo monsters are meant to be rare. Most encounters should involve minions, standard monsters and an occasional elite. These fights become very cinematic, much more than 3e encounters.
Using your action points, encounter powers and daily powers at the right time is important to.
Finally, you can not go into a fight with an solo or an elite monster without perparing for it and expect to come out ok. These monsters are very powerful and designed to be party killers when the DM uses them effectively.
When prepared with the right magic items, rituals and a group with synergistic powers, a group can lay waste to most of the monsters they meet.