I think grass needs a little more love. A lot of things are super effective against them or resist them. Perhaps they should hit dragon for neutral damage? I know that dragons where intended to resists all starter types, but Grass is already resisted by too much.
Poison needs at least 1 more type advantage, preferable fighting in my opinion. They already resist it and it makes sense since a strong body doesn't matter because poison targets your internal organs.
The last thing might be my dislike of the type speaking, but I would't mind of fighting types get a nerf. They hit 5 types for supper effective damage and are only weak against psychic and flying types. --- ..Gwaar... Haaaarr... Haaaaaa... Shoulda brought... more priests... Or some... babies... Dang...
Even bring back what it was in Gen 1, whereby Poison was SE against bug
Even though I want to agree with this, Bug being weak to bug spray which is poisonous... Bugs have quite a fair number of weaknesses as well.. If they are weak to poison I want them to resist psychic and/or dark.
I agree with Ice and Poison needing some adjustments. To my understanding, ice should get some advantage over water types, while poison probably should get its ground weakness removed since that does not make much sence.