Firstly, Words With Friends changed these letters scores:
L, U, N: move from 1 to 2
G from 2 to 3
H and Y from 4 to 3
B, C, M and P from 3 to 4
V from 4 to 5
J from 8 to 10
The rest have stayed the same. Although K and V both score 5 now there is only one K tile and still two V tiles. There are now more than 4 S tiles that regular scrabble gives you. There seem to be a lot of H and Y tiles.
A bingo has gone down from 50 bonus to only 35 which I quite like because it means there is less emphasis on playing one. And I reckon that, and not the scores of the tiles, is the biggest difference between the game and potential tactics.
And of course the bonus square positions have moved.
A lot of scrabble players seem to put emphasis on 2-letter words and frequency of letters appearing in them, which makes 'C' one of the worst tiles as it doesn't appear in any (along with V). It is useful to learn the 3 letter words with 'V' and I used to have a rule to get rid of it quickly even if only on single-letter. 'C' is useful in longer words if you have an open board and bingo opportunities.
Compare that with the 'F' that appears in a lot of short words but isn't that good for longer ones.
Now, does the changing of the scores of the tiles have a major impact in the game? I would say, not noticeably. The positioning of the bonus squares and the lower bingo bonus may have put less emphasis on aiming for a bingo and more on better placement.
How it would have a negative impact would only really be if the game became more dependent on being lucky enough to pick up high-scoring letters rather than low-scoring ones. Or, if the elevation of 'L' and 'N' here to 2 points meant the relative weakness of having a 'Q' for example was not compensated by its higher scoring value when you place it.
I think there are variations of the game that would put less emphasis on being lucky enough to hold a balanced rack (vowels and consonants), and that there were 2 bags, a vowel back and a consonant bag, and the 2 blank tiles put aside. When you draw, you can choose which bag to use, and in a 2-player game each player may choose when to pick up the blank among their letters. As you draw you see what you get before seeing what to draw next.
Then luck of the letter draw would become less of an issue.
And it's no use saying "good players know how to balance their rack". How do I control what I pick up if I bingo? How do I stop myself drawing vowel after vowel or consonant after consonant no matter how I play them?