1. Yes. I've also played more FFG games than I have purchased. Even further, I have read the rules for more FFG games than I have played.
2. FFG games I have…
purchased: Arcana, Blood Bowl: Team Manager, Hey That's My Fish! (Digital), Infiltration, Kingsburg (Digital), Rockband Manager, Rune Age, Through the Desert (Digital), A Game of Thrones LCG, Android: Netrunner LCG, Lord of the Rings LCG.
played: all of the above, plus Android, Battlestar Galactica, Citadels, Civilization: The Board Game, Cosmic Encounter, Elder Sign, Fury of Dracula, Gears of War: The Board Game, Kingdoms, Letter of Marque, The Adventurers: Pyramid of Horus, Tribune, Twilight Imperium: 3rd Edition, Wiz-War, Warhammer: Invasion LCG
read the rules: all of the above, plus Aye, Dark Overlord!, Blue Moon, Isla Dorada, Merchant of Venus (partial read through), Rex (also partial read through), Sky Traders, Call of Cthulhu LCG.
3. Of all the games that I own and/or have played by FFG, the components have always been quite functional. The only negative that comes to mind are the sizes of some of the game boxes. They often seem unnecessarily large, and usually that is only to accommodate the large rulebooks. It is especially annoying for the LCGs, where it would have been nice to have a thin, card-shaped box in which to actually store the cards contained within more appropriately without it taking up a lot of space. As it is now, I usually buy cheap card boxes and store my Netrunner and LotR cards in those.
The only game box that I felt was appropriately sized was the Rockband Manager box. It was just enough to fit the components, which is all you really need/want from a game box.
4. This answer would take a while if I were to go into full detail about my opinion of each game I've played, as I have a different opinion on each game, as well as my view of the pros and cons. To try and keep it short, all I can really say is that it depends on the game and the crowd with which you want to play. There are a few games (even ones that I've purchased) that I would under no circumstances recommend to you, such as Arcana. On the other hand, there are games that come highly recommended irregardless of the setting, such as Infiltration.
If you're looking for long, very deep, and very involved gameplay, I would recommend Android, and maybe Civilization. If you want quick, easy fun, Infiltration, Kingdoms, Rockband Manager, and Elder Sign are good choices. If you're looking for moderate length games, Blood Bowl: Team Manager, Tribune, Gears of War, Rune Age, Kingsburg, and Citadels are all decent choices. Keep in mind that I come from a background of CCGs and board/card/tile games, and don't have any real interest in miniatures or RPGs.