Yes it is easy, but in a match up against VIII, TA, TA2 and RW; it it pretty difficult compared to those titles. Compared to the whole series its on the bottom with VIII and X, while III and IV (DS and PS1 only) are easily the hardest.
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That's saying quite a bit. FF IV for the DS easily seems like the most difficult FF in the entire series, but to begin with it really isn't that hard at all.
When I look to a modern Final Fantasy, I'm expecting beautiful graphics, well-developed characters, a nice in-depth story, and a fun battle system, since that strikes me as what Square's main focus is for the Final Fantasy series as a whole. However, I'm not really looking for or expecting any challenge in terms of the game's overall difficulty level, since it doesn't seem like that's quite what Square is really aiming for.
Biggest pain to beat? X and VI. X because I never beat it, because I just don't care. I got right to Braska's Final Aeon, lost the battle and never bothered to try again. I just don't like X AT ALL. Same for VI. I beat it twice, the SNES and GBA version. Liked the SNES at first, but then I played V and I learned how VI causes people to unrightfully downgrade I to V and never liked it again. And it's my dislike for these two games that makes it a pain for me to beat them.
By your list, I guess FFIII might be the hardest. It's not really that hard of a game (except maybe the end), but you do have to follow clues on what job/strategy to use for different parts of the game.
Tactics can be kind of hard until you get the best skill combos...it's kind of like that in TA and TA2 as well. TA can have annoying laws but there are ways to bypass them and TA2's laws are practically optional as well.
I haven't played RW so I can't comment on that.