Yeah, I definately had a bit of an issue earlier with not being able to just throw my army at the enemy... played 2 games back to back and won both, but shouldnt have got either.
The first was against VC (Vlad, Konrad, Lv1 vamp, Lv1 necro, hoard of ~40 ghouls, 2 hoards of ~40 skelies, 3 wraiths inc shooty one and a corpse cart) and it really was a game of 2 halves. First half I couldnt roll for toffee, while the VC player basically didnt fail at anything he tried.. and was trouncing me until Vlad stupidly accepted the challenge of my ancient. 2 turns later I finally make him fail a few wards and he dies... failing his carsten ring save. Losing his general and main caster (and letting Konrad sink to Ld6 for hius frenzy/spidity) meant that the heart had gone from his army and the treeman finally made its weigt felt, tearing through the rest of his army (as well as my shooting finally being able to overcome raised ghouls and massacre them).
The second game was against a WoC army that I shouldnt have been able to scratch... and I essentially couldnt (Lv4 MoT on disc with 2+/3++, BSB on disc with 2+/3++, exalted hero, ~20 chosen MoT with shields, ~20 warriors with MoT and magic standard, ~30 marauders with flails, chariot and MoT warshrine). Long story short... luck was the winner in our game, with nothing happening as it should have: took me ~70 shots to kill a 3++ T5 4W chariot with my S4 glade guard, a miscast infernal gateway rolled S3 flaming and terrible dice saw my ancient take 6W in 1 turn... but the miscast then rolled a 3 (with puppet only managing a 1) so we also saw the Lv4 caster get sucked into the warp (both lords gone in 1 spell) and my waywatchers pinging hell outta the BSB but only getting 1, rather easily saved KB. After all that I won by attrition (the proper WE way), avoiding the warriors and chosen bacause I just didnt stand a chance (even attempting combat would have been suicide- I never even bothered to shoot either unit as I would never have been able to wipe them out to get their VP). The Lv4 killed himself, I shot down the marauders and the chariot (70 S4 shots into the chariot finally killed it) and I took down the warshrine at the end of turn 6 (my eagle had rear charged it and only took 1 wound, winnning by 2 but the shrine passed its Ld.... instead it flanking wardancers and rear charge from 5 glade guard to stack up CR in my favour enough for it to break and get run down).
All in all today Ive learnt that treeman ancients have the potential to beat armies by themselves if you can avoid the few counters that'll kill them... but that other then them there isnt a good counter to the strongest enemy units other then avoiding them, although with the right tactics reasomably cheap WE units can take on 'tricky' units. Other then that lots of glade guard and possibly glade riders constantly pinging enemy units will eventually take their toll, even against VC (as long as you knacker their vampires).
I dont think WE are as bad as everyone says they are, but while they remain a fun army to play the main emotion in the game is annoyance- the WE player will probably find it hard to do significant damage to any non-elf enemy, while most armies will struggle to catch the WE (especially in 8th with its reliance on fewer, more powerful infantry units).