Just finished Wild ARMs 5.
I consider it the best overall in the series and, yeah, after the finale I'm inclined to leave it as "best game of the PS2 era, wouldn't quite make Top 5 in the PS1 era but would at least be in the conversation."
The Downside
Battle gameplay is slightly weaker than WA3 or 4, story is weaker than WA2, and puzzles are weaker than WA1, 2 or 3. The voice acting has enough bad performances to spoil it and shutting it off turns off the music and SFX in certain scenes, apparently due to a bug. The pacing goes south toward the end of the game. The last two PCs to join aren't as well developed as the first four.
The Upside
It's polished to a sparkling jewel.
The story is superbly TOLD, even at its weakest points (contrast WA2 where the story itself was excellent but the translation and/or script did it terrible disservice). Scenes that have never worked for me in any game or anime, WA5 absolutely knocks out of the park.
I had a series of complaints about various aspects of the gameplay. EVERY SINGLE ONE was addressed within one dungeon of my first raising it. That bit about pacing up above? Until the very end of the game, the pacing is the best I've ever seen, introducing solutions to every problem as it arises, pulling the story along without sacrificing gameplay or characterization, giving you time to explore and making it both rewarding and fun to do so.
The gameplay is the only area that's good, rather than great. Bosses generally lack the fascinating gimmicks WA4 bosses boasted, being more like WA1-3 bosses on a hex grid. The challenge is well paced (shutting off randoms ASAP and judiciously running makes bosses hard and randoms in the next area interesting) and the character customization options are interesting, if maybe a bit underused.
Despite not being done by Michiko Naruke, the soundtrack manages to capture everything she did so, so right in the Wild ARMs series. It seriously threatens for a "best WA music" crown, which is basically synonymous with "best music" (my most-listened-to track ever is the extended version of the WA2 opener).
The graphics are contenders for PS2-best. I'm retroactively less impressed by the PS3 game(!) Valkyria Chronicles because Wild ARMs 5 nailed the "3D anime you can play" look a full generation earlier.
9/10 and near the top of the 9s.
(In other news, finished Devil May Cry 4 on the PS3. Devil May Cry game I can actually complete! Easy mode that makes enemies weaker rather than gimping the controls! Woo! Probably an 8/10? Not graphically impressive by PS3 standards, the music gets repetitive, and a few of the jumping puzzles were aggravating, but those were my only knocks.)