Rockfort Express: திருச்சி அவனது கோட்டை, இரவில் சென்னை வரை வேட்டை, அவன் தான் மலைக்கோட்டை. - Vijay Baradwaj

Let's see...
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1) TN Express
Speed : 9/10 (It seriously rocks when it comes to speed)
Punctuality : 7.5/10 (12622 gets delayed by 10-15 min although 12621 manages to reach on time on several...
more...

occasions)
Food : 8/10 (Average food)
Cleanliness : 6/10 (Once upon a time this train had clean rakes but due to SR's negligence, its rakes have become dirty)
Total : 30.5/40
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2) AP Express
Speed : 8/10 (Ok! Not as fast as TN)
Punctuality : 9/10 (Quite punctual... manages to reach on time on several occasions)
Food : 8/10 (Average food)
Cleanliness : 9/10 (SCR rakes... Enough said!!!)
Total : 34/40
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3) Karnataka Express
Speed : 8/10 (Good speed! It runs fast even in the non-electrified sections)
Punctuality : 8/10 (Somewhat better than TN)
Food : 8/10 (Average)
Cleanliness : 7.5/10 (Yeah! It's clean, but not as clean as AP)
Total : 31.5/40
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4) Kerala Express
Speed : 5.5/10 (Speed is ok till Kerala after which it slows down a lot, thanks to the numerous halts in Kerala)
Punctuality : 7/10 (Not so punctual)
Food : 7.5/10 (Average)
Cleanliness : 4/10 (Horrible)
Total : 24/40
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Correct me if I'm wrong.