All 3 instances are 3-man, levels 20-85. There's a startup quest in Bree, but it isn't required to run the instances.
This instance has you retrieve a stolen eagle egg from the frost giants up in the Misty Mountains. It's basically a winding path up the mountain side. Along the way, you'll be harassed by the giant who throws boulders at you.
The first boss isn't really anything special. He summons adds and you have to avoid the giants' boulders.
The second (and last) boss is somewhat different in that the egg gets its own health bar. You have to defeat the giant while keeping the adds he summons off the egg.
Seat of the Great Goblin
The goblins are bolder than ever before. This might be caused by a new Great Goblin. Head into the tunnels under the Misty Mountains to dispatch him before things get ugly. If you've been to goblin-town in the Misty Mountains, this place looks familiar. Be prepared for large groups of low-morale mobs.
The first boss is basic tank-'n-spank, while at certain morale thresholds, he becomes unattackable and does a ground-slam. Occasionally, rubble will fall down.
Second boss is somewhat spoilerish in its tactics. I'll only say that the fight isn't over as fast as you'd think.
Webs of the Scuttledells
The elves of northern Mirkwood are concerned about the stirring spiders. Find out the cause and root it out. This instance takes place in the Scuttledells in Mirkwood. Expect a large variety in mobs, ranging from the occasional spider and orc to undead and other vile creatures. First boss, pulls quite a few adds, but shouldn't be too difficult for those prepared. The second boss is fought in quite an interesting arena and requires a little more than the usual tanking, as there are several mob-spawning cocoons that have to be cleared away with a torch.
Price/Value: 2.5/5 (At 1495 tp, these 3 instances alone won't cut it. A lot will depend on the raids.)
Storyline: 3/5 (Quite disconnected from the main story, but it's clear that these are walk-ups to something more interesting.)
Atmosphere: 3/5 (There are some nice locations, but nothing that makes you hold your breath.)
Tactical: 3/5 (The boss fights are interesting but few deviate from normal tactics.)
Total: 11.5/20: These instances are far from needed. They do come with the RoR expansion, so maybe that's an incentive to get them. For those of you who buy the content separately, I'd advise on getting some higher-priority stuff first (like quest packs).