The author has cogently stated that we should invest our resources in unmanned space flight but he has failed to explain some important details and has made many assumptions that needs to be explained.
First and foremost, he has to explain the term "success". Is getting the pictures and information like if water exists or not, success? Or finding out that can life exists on outer space is success? If later is the success than manned spaced flight is the only solution to find that out.
Author has also assumed that the information gathered from unmanned space flights is enough while there are other very useful information like if the conditions are suitable for survival of living things and for that manned space flight is the only solution.
Author has failed to explain the terms "costly" and "dangerous". The statistics needs to provided that explains why is the manned space flight costly and dangerous? How many of pasts flights has resulted in casualties? Also he has not explained how successful are the unmanned space flights? Has there been significant tests that prove the success of unmanned flights or was it just one series of tests?
The other has also failed to realize the scenario where an unmanned space flight finds some thing which cannot be identified from pictures or something that exists inside some particular object. These things cannot be identified from unmanned flights but needs manned space flight.
This is premature of the author to conclude that we should invest more resources in unmanned space flights since technology can never completely replace a man.
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argument 1 and argument 2 can be put in one argument
argument 3 -- not OK. it is true: Manned space flight is costly and dangerous.
argument 4 -- OK
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flaws:
No. of Words: 265 350
Attribute Value Ideal
Score: 2.5 out of 6
Category: Satisfactory Excellent
No. of Grammatical Errors: 0 2
No. of Spelling Errors: 0 2
No. of Sentences: 14 15
No. of Words: 265 350
No. of Characters: 1308 1500
No. of Different Words: 130 200
Fourth Root of Number of Words: 4.035 4.7
Average Word Length: 4.936 4.6
Word Length SD: 2.373 2.4
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No. of Words greater than 7 chars: 44 40
No. of Words greater than 8 chars: 23 20
Use of Passive Voice (%): 0 0
Avg. Sentence Length: 18.929 21.0
Sentence Length SD: 9.975 7.5
Use of Discourse Markers (%): 0.571 0.12
Sentence-Text Coherence: 0.397 0.35
Sentence-Para Coherence: 0.671 0.50
Sentence-Sentence Coherence: 0.202 0.07
Number of Paragraphs: 6 5