intensifiers of comparatives in negative sentences

[Sitifan]

1. The food wasn't much better than I expected.
2. The food wasn't a lot better than I expected.
3. The food wasn't even better than I expected.
4. The food wasn't still better than I expected.
5. The food wasn't a little better than I expected.
6. The food wasn't a bit better than I expected.
Which of the above sentences is NOT acceptable?
Thank you very much for your reply.
_________________
Thank you very much for your reply.

[Torsten]

Without further context only the first two make sense and sound natural.

TOEIC listening, talks: A voice mail message providing hotel info

[Yankee]

1. The food wasn't much better than I expected. OK

2. The food wasn't a lot better than I expected. OK

3. The food wasn't even better than I expected. Unlikely, but possible in just the right context.

4. The food wasn't still better than I expected. No

5. The food wasn't a little better than I expected. Extremely unlikely.

6. The food wasn't a bit better than I expected. OK (This suggests to me that you expected the food to be bad and it was exactly as bad as you expected.)
.
_________________
"Nearly all men can stand adversity, but if you want to test a man's character, give him power." ~ Abraham Lincoln