I might take a peek at this in the future. When I saw it awhile back it looked a bit boring thematically. Space stations that didn't look too exciting to explore. Are there varied maps?
Someone asked about building a party with 5 classes. Lords of Xulima (which I'm playing now) has 9 classes, but there are many ways to build different characters within those classes. For example, my Cleric is a two-handed mace user, so she does a lot of raw damage + a decent stun. However, her Attack Rating takes a hit (i.e. her chance to hit) by using such a heavy two-handed weapon. BUT, if I bolster her Agility enough it will help to negate the Attack Rate hit. I also have chosen to develop her Light Ray spell more over healing spells. One reason for this is to have another high damage spell to cast at any enemy in any row (which is always a plus for tough back row enemies), plus my Divine Summoner has invested a bit in the healing/cure bleeding summon. So essentially my Cleric splits healing duties with the summon in exchange for dealing better physical damage and supporting with a Mage-style spell + stun effectiveness with her weapon.
Of course, you could make a basic healing Cleric as well. Or, you could focus on her status effect relieving abilities and leave more of the healing to item usage + the healing summon. It also varies how you outfit the armor. I chose to focus a bit on her armor ability so she can be a decent front-row fighter and use heavier armor.
One caveat is that the loot system does have room for improvement, mainly in items having truly special or unique effects. There are a lot of items of varying quality, but it seems like there are not a ton of raw enchantments, so you'll see many enchantments (which are basic, Platinum Helmet of Organic Protection, Cloth King's Cloak, etc.) repeat, with the main difference being the effectiveness of the enchantments, the armor rating and the overall value of the item. It's not terrible, but I would have liked to see Unique-style weapons/armors/items, such as The Bleeder (a giant claymore that does huge bleeding damage) or The Flail of Fail (causes a big stun but is harder to swing accurately and doesn't do as much raw damage) and this sort of thing. Those are only basic examples off the top of my head.
As for the character building stuff, there's a lot of this sort of thing in the game. Party synergy in a game like this is more important than the base class you choose, so really it's more about how you develop your individual characters + their synergy within the whole party, IMO.