I will give you my definition of strong and weak.
As i said i'm a relatively new player but i've played quite a few characters
already, know a lot of preps and am quite comfortable with a lot of classes.

I know i can play an assassin/ranger/daggerspec/transmuter/necro and do quite
well. I also know that if i play an orc i'll have to be extremely conservative with
my playing style and i'll still get my ass handed to me very often (especially these
days with so many assassins/rangers/dagger specs/transmuters around).

It is easy reading Kubilak logs to say that orcs are fine but a few logs do not
prove that orcs are a strong class. Logs of kubilak bashing down assassins for
instance (extremely stupid tactics from assassin side) or some old ones he has
posted in the past of him killing two rangers who were utter pillocks. The surpise
for an orc player comes when you try to kill ppl who know what they're doing.

Orc vs knowledgable dexy assassin with perfected defenses/weapons = dead orc
Orc vs knowledgable ranger = dead orc (how helpless and dominated orcs are against rangers in the wilds is quite funny,
no other class comes close i think)
Orc vs knowledgable dagger spec = dead orc
and you could go on and on and on (and pill popping doesn't help in a lot of these scenarios)

Kubilak said that a lot of his opponents were taken by surprise because they were
expecting to mop the floor with the orc and this is true and evident in a lot of his logs.
I believe that a lot of his opponents had not played a lot of orcs before or had no clue
of high level orc tactics that is why they acted stupidly and got killed. I don't think a player
who knows what orcs are about (has played some himself) is going to have any problems
destroying an orc player. The unreliability of orc skills only seems to reinforce this.