Negative

• 'There is something very pompous in his stile'

  shows his pride/self importance
• 'His cousin was as absurd as he hoped'

  Mr Bennet's comical relief about Mr Collis being an oddity shows he is glad his daughters will not marry someone like that
• 'Those little delicate complements... a sort of attention which I conceive myself peculiarly to pay'

  He is calculating and unashamed about planning compliments and making others like him by using flattery
• 'neither the letter nor its writer were in any degree interesting'

  Mr Collins is monotonous, in both letters and in person; shows his simplicity
• 'He had not been long seated before he compliented Mrs Bennet'

  He's making an effort to compliment her, perhaps being sycophantic
• 'but he continued to apologised for about a quarter of an hour'

  This makes him seem desperate and he's slightly humiliated himself, apologising repeatedly for things he hasn't done makes him seem weak