And we met quite our share of undeads already

My "no strength, no sneak attacks" daggers against those truly is not quite efficent.
If you're interested here's the party (at the time of the encounter):
drow wizard level 4 (ECL 6); mix of utility spells and attack spells.
Fey'ri rogue level 3 (ECL 5); sneak and mechanics
human rogue level 6; sneak and social skills TWF
human monk level 6; high dex and wis
human swashbuckler level 4; social skills (high int and high cha) TWF
human cleric level 4 social skills
The strongest party members have 14 strength; the cleric and the fey'ri. Which happen to be the lowest levels too. All other characters have 10 in str. As you can see, no fighters.
Encounters tend to either be highly in our favor; when sneak attacks and ambush tactics kicks in. Or highly against us when we are forbidden sneak attacks (undead or inability to flank, etc).
We had two encounters with the same band of elves. The first time, they ambushed us and mopped the floor with us. The second time, we ambushed then and mopped the floor with them. The first encounter was quite humiliating due to a clever use of
entangle by the elven druid. On the second encounter I sneak attacked her real good

(Although I did amlost die due to her
poison spell.
Since the beginning of the campaign, if we can't get the suprise round, we're hard pressed no matter the CR. I like it that way though

makes it all more realistic IMO in a sense.