I played a succesfull orc-team (it won the league where I live) and a almost just as succesfull goblinteam, so the first thing I'll say is:"Greenskins are da best!" (when it comes to bloodbowl.. with warhammer they definitally going down against Wood elves
If you need the rules, they can be found at the specialist games section of the GW site.
There you'll find a file which contains all the temas available. When I looked at amazones and the 4 different kind of elven teams I came to this conclusion. You're definitally going for a passing, running and scoring game, instead of a bashing, fouling, running and eventually scoring game
Looking at the amazones a few things catch my eye. They're alot cheaper than all the elven teams. And they all have the dodge skill which gives them re-rolls when trying to get past players from the other's team. Besides that, they have mediocre strenght and agility. The things I don't like are the fact that they all have the same movenent value(which is a fairly average movement value), even the catchers and blitzers, which all move faster in other teams. And another thing that I don't realy like is the fact that they all have low armour value and so they're very easy to bash to the ground and out off the field.
Now for all the elven teams. They're all cost an above average amound of gold. But in return, you get an above average agility which makes it a lot easier to pass and catch the ball and to get past players of the other team. Another positive thing is that their catchers and blitzers have above average movement. Now to look at the different elven teams:
Elven teams (I'm still wondering what Kind of elves these ones are):
They're the elven choice with the cheapest linemen,which is good since those guys will be the core of your team, but they're more expensive than humans, orcs or amazons. The different players have the base skills that are importent for them. The only problem (in my opinion) is that every player has fairly low Armour Value(except for the blitzers, who should have a higher AV since they have to bash theopponents to the ground). Their Catchers and blitzers look really usable because of the extra skill, but this also makes themmore expensive.
More costly than elves, but they all have better AV (except for the witch elves). they're lack of catchers is a minor disadvantage compared to the others. But the witch elves look very fun to play with (looking at their skills) and I think the team will de very good if you use them in a running game instead of a throw and catch game, at least until you've had the chance to give someone the catch skill.
High elf teams:
They look a bit like an upgraded human team. Fairly basic but with a higher agility(which makes them more expensive than humans). I think it could work really well, exept that it will be hard in the beginning to get reserve players and re-roll counters because of the cost.
Wood elf teams:
Very fast! Even the linemen are fast! These teams can really outrun their opponents. But off course, just like in warhammer they've got a low armour value so they're easy to knock out off the game, which isn't really something you want with a team with expensive players. But they really have the potential to give you high scores.
I haven't really used any of these teams myself and based my findings only on looking at the stats and skills (and experience as an opponent). I'm also more of bashing, fouling, running and eventually scoring game-player, than a passing, running and scoring game-player. I do know that both gamestyles have just as much potential which is more than 'a pick-up your teammate with the ball and toss him as far away as possible'-gamestyle which goblins and halflings are known to use (although I should be carefull with that statement, knowing that in an american bloodbowl-league a halfling team ended up first
). I do hope the things written down here help you a bit.
As a last comment, If I had to choose between one of the elven teams and the amazones, I'd choose High elves myself. Mainly because they're a bit cheaper than dark elves which share the same higer AV with them than the other teams I can choose from. This makes them more capable of stopping enemies that try to break through the lines.