Psychic was a great (read: decidedly overpowered) type in Gen I, but its time in the lime light has passed (Sorry, Ame).
And there are some decent Grass pokemon out there, but the type itself is pretty horrid.
Deal with it.
And Ice may be a terrible type defensively, but it's a great attack type; similar to how Steel is superb for defense but offers unimpressive attack coverage and is resisted by several common types.
[spoiler]Also, Water is the best type~[/spoiler]