Snailish is right on target, but I thought my 2 Warriors stories might help.
On both of my Warriors, I soloed mostly, grouped a bit and regularly 65-70+, kept my AAs up and worked on gear as necessary, and occasionally (regularly some times) open raided.
Defiant gear makes the need (or even improvements) in raid gear pretty minimum. Both used the Fabled time and the Summer revamps to get better than defiant gear. The revamps, in particular, offer very raid competitive gear above the defiant level and quality. However, even this gear will become out-dated compared to raid level gear at the highest level and content. This is not to say, it's not worth getting, but if you take it slow, and keep working on AAs, progression, upgrades, etc. it will serve you well, while you working toward the maximum level and progressing through content to be able to get the top tier group gear (or raid gear, if you plan on raiding regularly).
With this being said, I've known people to stick with mostly bazaar gear to about 80 (haven't played much in content above 80, and none above 85), and done descent. Again, though, it requires AAs as well as gear, and extensive AAs can make up a bit for sub-par gear. Similarly, I have known people to burn through levels and start raiding fairly soon, and do ok as well, but that was with the help of a raiding guild, keeping their equipment top of the line, and burning through AAs once max, or near max level (low AA count bonus makes this easier than it used to be, but Power Leveling AAs is fairly quick and easy, if about 10 or more levels from max, with a max level toon that knows how to do it). That being said, I don't recall any group only players being able to be successful with out alot of work and time leveling in such a fast manner.
This is why I just took it kinda slow (Note that 1st War got almost max level 80+ right after it was raised to 85, with about 1400 AAs (the first 500 or so before the low AA bonus) in about a year or slightly more. This was my main, but not the only character I played during that time, and still played my old main alot as well. I was often recognized for how effective I was, and I attribute that to both keeping my gear up (with cultural armor and some raid gear at first on my first War, then defiant and the revamped gear later on, and mostly defiant and revamped gear on my 2nd with a few raid pieces on my 2nd) and AAs, and experience as well, to know how tough of content I could handle.
Anyway, overall, bazaar gear has been fine upto near max, varying some what from expansion to expansion, but generally always within 10 levels of max level. Although expensive, at 65 Qvic gear used to be farmed alot prior to defiant (no trade quest pieces, and used to be 10-20K / slot, now 5-10K / slot) but defiant is almost as good and much cheaper. At 70 with the number of open raids, if you don't mind doing the faction work, the quested AoA armor often rots on 2.0 open raids, and is very nice to near 80 (it out does the TSS 75 level group armor). As far as I know, every server (non TLP server) open raids Anguish, it's just a matter of finding out who runs them and when.
Hope this helps some.