Evergrace and it's sequel forever kingdom, basically from software's prototype for dark souls.
Legaia 2: duel saga, i'm actually surprised how few people even know this game exists, i prefer it over the first game.
God Hand a FRIGGIN INSANE 3d beat em up by capcom of all companies.
Grandia x-treme and grandia 3, x-treme's a odd case where it's a rpg you play for the combat instead of story, grandia 3 is just generally forgotten but is more story based.
Megaman X Command Mission, something you rarely see, a jrpg in the megaman x universe, done surprisingly well.
Breath of fire: Dragon Quarter, this game is the black sheep of the BOF series, it's not a bad game but takes getting used to the way it's restart system works
Metal Saga, a criminally underrated metal saga game and the only one to release in english before xeno, this is one of my favorite ps2 games, basically a open world jrpg with tanks, a rare thing especially back then.
Thunder Force VI, a japan only side scrolling shooter, a bit easy but still plenty of fun, the language issue is only for a couple of screens and is easily dealt with.
Shadow Hearts, the entire series is good but the second game is generally the best game in the series.
Wild arms, a wild west style rpg series, 1 and 2 started on the ps1, alter code F is a remake of 1, 3-5 are on ps2, of them most would say, Alter Code F, 3 and 5 are the best games in the series, the last mainline game, 5 is probably the best game in the series if you ask me though loses some of it's western asthetic.