Probably, but this thread has quietened down now, so not many people will see it, but I'm glad i have it for future reference, thank you Undesirable.

One think i do hate that really really pisses me off that often happens when following someone else's build (not just this game, any game with character builds).... Getting butt fxxxed by the build author because he missed some or more critical information, or made the information too vague and or ambiguous and you did the wrong thing as a result, then at some point later on after that you discover the mistake and then mutter the words "oh fxxk" as you realize you have just spent all those game hours for nothing!

I figured the chance of rolling a Fighter with those statistics to be 1 in 2700. The 1 in 27 is about the probability of rolling a total of 84 or more; and the 100 is the probability of rolling 18/00 for strength.

One alternative is if I start out in BG1, then there is a tome to increase strength to 19. Then the 18/xx strength does not matter except for one part of the game where a shadow might drop strength from 19 to 18/xx.

EDIT: I just noted that the OP stated BG2. I still want to play a game start to finish with a Berserker Cleric, but have not gotten around to it.

Another alternative might be to exchange the wisdom and intelligence. I heard great things about the Kensai-Mage.

Look, BG1 ORIGINAL rolling system, has the BEST chances of getting ULTRA lucrative rolls. No other game in the BG series, not even the remakes, have such a fabulous and rewarding (re)rolling. 1 IS king. Forget about calculating chances; in 1, you can get godly rolls in very low time. And -00 is not very very rare...

Plus, yes, indeed, you could use the tomes. There is a tome for one stat, exception is wisdom that has 3...

1 is better than 2?

A long time ago, somebody here helped me understand the rolling system better. For a Fighter, this is how I think it works:
1. Roll 1x3d6 for Strength. If this is less than 9, roll again.
2. Roll 5x3d6 for the other 5 scores.
3. Add them up. If the total is less than 75, start over.

So one hundred rolls like this should yield a very good total.

Now I wonder if they skew the percentile roll, like say, best of two rolls. If this is the case, then you see 18/76 or better 43.75% of the time instead of 25% of the time. (EDIT: Nope - It looks like a straight-up d100 roll.) This is an even better argument for your Berserker-Cleric. You can send him into BG2 with 21 Wisdom.

Are we talking about creating a character in BG1 and then importing him to BG2?

So if i played for a while in BG1 and built up experience, then exported my character to BG2, would that give me an even better head start in BG2?

Yes in some ways, but not in others. You'll hit an experience cap in BG1, and BG2 starts you with that exact amount of experience -- so in other words, you can't come into BG2 with more experience by beating BG1 (note: this isn't true if you're playing the BGT mod, which removes the cap). Second, you lose all equipment at the start of BG2, so there's no advantage in having good loot from BG1.

However, you do carry over your stat gains no matter what. You can collect tomes in BG1 that boost all of your stats by 1 (and wisdom by 3), and there are no such tomes in BG2. So you can have significantly better stats by importing a character, even with stats that are over the maximum, which would not be possible otherwise.

BG2 doesn't have the tomes, but there are still a few places where you can get stat increases (primarily in ToB). Though there are also a few places where you might get a stat decrease.

Also you might start BG2 as a level 7 fighter-type character with 18 Constitution and 10+7x4+6d10 hit points, averaging 71hp. Or if you played BG1 and got maximum hit points per level, then you are starting with 19 Constitution and 105 hit points.

Using KB's recommendations, you have a Fighter with 19 Strength, Dexterity, and Constitution, 21 Wisdom, 10 Intelligence, and 4 Charisma - and 105 hit points.

I think that experience cap coming from BG1 to BG2 is a good idea, you don't want to spoil the game by being 'too' strong.

But can i still do the berserker cleric build if i started in BG1 and what changes would be needed if any?

Do you mean if you rolled a Fighter in vanilla BG1? If your alignment is not Lawful, then yes.