You obviously know how to google facts but you lack understanding and background knowledge to interpret these facts in a business context
Debt to equity ratio: Norwegians Debt to equity ratio is 5.83. What does that number mean? Are you talking about long term, short term liabilities or total debt? Is it high or low? In respect to what industry? Start by educating yourself about what figures are normal for capital intensive industries like aviation and google the stats of other airlines.
Also, you particularly fail to to mention that Norwegian Debt to equity ratio has actually shrunken from December 15 to September 16 all while financing an aggressive expansion. What does this tell you?
Credit rating: Norwegians Corporate Credit Rating is baa3. That Moodys rating is equivalent to a S&P Rating of BBB- and denotes a lower medium grade investment rating.
Here are some other airlines corporate credit ratings from 2016.
United Continental Holding: BB-
American Airlines: BB-, upgraded from B+
British Airways: baa3, upgraded from ba1
Lufthansa: BBB-
Given your now newfound knowledge, how would you now rate Norwegians credit rating? Normal maybe?
Rising overcapacity? Given the fact that the airline has just surpassed SAS Group in terms of passengers carried in 16 and that a lot of the new planes this year will be used to increase capacity on routes as demand is high and the planes are full tells me overcapacity is not really an issue.
Rising interest rates? Yes Trump might shutdown Ex-Im Bank but in the end, do you really think that a company which is able to get financing for 100 brand new Airbus has trouble financing their airplanes?
Rising fuel prices? Rising fuel prices will affect everyone and will be in the end paid by the customer anyways. A young, fuel efficient fleet however will give you an advantage so i also don't see this as more of a problem for Norwegian than for any other airline.
Escalating Fare war and competition? The fact that companies are adapting to Norwegian and not the other way round shows how successful and good their product is. Competition is always good and will in the end benefit the customer and rightly so, the times of milking passengers on the NAT Routes with artificially high prices by the fare controlling JVs are over.
Underpaid and overworked work force. Highly subjective. You sadly can't really compare the salaries paid in the US to the EU in the aviation industry in any case, whats paid here is ridiculous compared to whats on offer in the US. The fact however that there are many people are leaving jobs/contracts in the middle and far east to join NLH on (compared to their previous level) reduced T&C tells me that money alone isn't what makes people happy in the long run. And again, i challenge everyone to find me a better offer in the EU right now, where you can join as a senior first officer / rca, earn 100k€+, can live at home and commute to your job from all over the EU, and have the prospect of becoming a captain on a widebody within a year.
Also yes you work more for your money compared to a legacy carrier but its not worse than any other airline taking advantage of EASA max FTL. And honestly, what makes people feel tired and overworked is really subjective and is different for each individual.