Played my first game tonight at 2000 points against Eldar (who's not used to fifth yet and trying new units). He roughly had:
Autarch in a unit of 10 Dire Avengers
Farseer in a unit of 10 Banshees (riding in a Wave Serpent)
2 x 10 Pathfinders
10 Guardians with Eldar Missile Launcher
6 Dire Avengers (riding in a Falcon with Eldar Missile Launcher)
2 Vipers with Eldar Missile Launchers (in a squadron)
2 Fire Prisms
Playing for objectives, I ended up winning sitting on three (he contested one), and he had one. Some observations:
A fifty man unit takes a lot of space on the table, especially in base to base! I had them in cover at the start of the game expecting to be charged, but I managed to either take out or intimidate potential assaulters. They raced up the board to take an objective using "Move, move, move!" multiple times. Took a full hit from a Fire Prism through cover. 27 hits, ended up being 9 kills - not even a fifth of the unit. Feels strangely good that I can shrug off that many kills.
Leman Russ Squadron had trouble getting good targets; there weren't much infantry so they were shooting at armour all game. Didn't kill anything, but it scared the Eldar into not disembarking infantry within range, or being careful where the tanks went.
Psyker Battle Squad couldn't get targets in range to reduce leadership, so I was only able to unleash the template, mostly against squads in cover. Didn't do much.
Mechanised platoon did well, rushing up and around to sit on an objective in cover. Infantry ran into the ruins using Chimeras as mobile cover from sniper fire. Multilasers helped to take down Vipers, but did a lot of shooting at things they couldn't hurt (Pathfinders in ruins, AV 12 vehicles) as there weren't many other options; this was mostly a vehicles vs vehicle fight.
So what did I learn? I need more long-range anti-tank; I had three lascannons and that's it. Many meltas but they were never in range. Some way to take out the skimmers would be nice, but Hydras wouldn't have an additional advantage as he never relied on Skimmer Moving Fast; he was more interested in shooting.