For me, or at least the types of CWE lists I like to run, it's the reduced BS for moving and shooting heavy weapons that hurts.
In my LGS,I could get by fine with some lances on a pair of Serpents, and two squads of defenders on foot (EML or lances). I usually run with mixtures of Reapers, Hemlock, wraithguard etc. as well as moderate options such as Shining Spears and Warp Spiders (that help with lighter AT and MCs). So I would have a decent spread of AT options. However, the penalties for moving and shooting heavies makes this unreliable for my core force.
This makes for some very difficult list building at 1500 points. A unit of five D-Scythes are a good option here as they are quite threatening to vehicles, monsters and infantry. They won't vaporise mid-high toughness vehicles but they can still take a decent chunk off while still evaporating more elite infantry units (which is what I take them for).
Why do the Eldar have heavy weapons again, anyway? Back in 3rd the bright lance was an assault weapon - that makes more sense still now that vehicles don't have specific rules about moving and firing heavy weapons. I agree that it's painful - in my vs. Chaos battle my Fire Prism was more or less out of the game after taking 6 wounds and going to BS 3 (sorry, 4+) - of course it wasn't helped by rolling 1 every time I used the anti-infantry mode... Making all Eldar weapons other than support weapons assault (potentially even things like pulse lasers and doom weavers, to reflect being grav-mounted - maybe keep the really heavy weapons like prism cannon and the Wraithknight weapons heavy) wouldn't exactly overpower them.
I'm waiting on most future purchases until the new range hits - I've noticed that all the 2nd Ed. models (save the Fire Prism, which uses a Falcon base - though the basic Falcon and WS seem to have been canned), plus the 3rd/4th Ed. Rangers and characters, have gone to 'Online only' and some are now out of stock. I suspect a big update to the range is coming - and the Shining Spears need it particularly, partly because their components were always fairly poor but mostly because they don't yet have the current jetbike models. The unit does look good these days, though.
Otherwise your list sounds similar to mine though the Hemlock's another unit I have yet to invest in.
From discussions in another thread I'm coming to think War Walkers are the way to go for AT, though I'm holding off on those until the codex in case that changes the optimal weapon loadout. There are still Fire Dragons, but they're still basically one-shot (and I'm still missing my firepike Exarch model. It's not actually the worst thing in the world to have a flamer because it's a good weapon and the Exarch can always use a meltabomb for his ranged AT attack, but he always dies before having any real chance to use it. I am thinking of just getting Fuegan - I broke my old Fuegan model many years ago). The problem with War Walkers is that a brightlance setup makes them worthless against anything other than vehicles - Dark Reapers and Fire Dragons are credible anti-infantry units as well as having an AT role. I've suggested an EML setup for Walkers as an option, but the Eldar heavy weapons need rebalancing and it could well be that another weapon is better in a few months.
Coming back round to the Wraithguard, the fact that the wraithcannon's an assault weapon seems a good point in their favour in that regard as well.