...I mean if they go as follows...
.com .net .org .info
So they are in maybe 4th place when it comes to popularity and demand. Or at least that's how it used to be.
I think it's actually a very big mistake to try to rank TLD's for the most part.
With the obvious exception being .com which just about 100% of the time is the best one.
After .com however .. the next best TLD(s) should be ranked based on
CONTEXT!
(.co vs .biz for example are two TLDs one could argue have end usage similar in scope/context)
Many domains great for .info are virtually useless in .net .. and vice versa.
One TLD similar in scope to .info however is .org. Sometimes the .org could indeed be better than .info .. and in some cases it could even be the other way around depending on context (although I'm thinking .org would usually be the better of the 2 .. but not always).
If anyone is thinking of a domain in .info that is good .biz, then definitely think twice. Obviously many such domains do exist .. but many more do not.
.info is great for exact match domains on things people are looking for more information on.
My best one is Diet // dot // info .. which I actually acquired before I got serious about domaining (was planning on eventually developing it .. but we all know how that goes .. lol).
All that being said ... remember that as domainers we are looking to resell our domains .. which means we need to be buying domains people will actually buy .. and there needs to be enough of a markup to make an overall profit in our portfolios (meaning we need to make multiples that also cover renewals on domains that don't sell right away). Which leads to the fact that most .info domains do not meet those standards as most do not have much commercial appeal .. there most definitely are exceptions .. but as a rule of thumb I'd avoid just registering them in large quantities hoping to get a fixed % of the .com version .. that strategy certainly isn't something I'd suggest.