SQL Server | Is my stored procedure is OK?

CREATE PROCEDURE spCountTableRowWHere
    @TblName VARCHAR(50),
    @TblID VARCHAR(10) = 'Id',
    @WhereClause NVARCHAR(500) = '1=1'
AS
BEGIN
    DECLARE @Query NVARCHAR(500)
    DECLARE @ParamDefinition NVARCHAR(40)
    DECLARE @Count INT
    SET @Query = 'SELECT @C = COUNT('+@TblID+') FROM '+@TblName+' WHERE '+@WhereClause
    SET @ParamDefinition = '@C INT OUTPUT'

    EXECUTE SP_EXECUTESQL @Query, @ParamDefinition, @C = @Count OUTPUT
    SELECT @Count
END

I am new in SQL and I am wondering if this kind of procedure is better than a separate procedures for different tables.