Are they playing Gestalt? (Is that why everyone has two classes listed?)
If so, they're rather missing the point, which is to shore up the weaknesses of each class, not to overlap their strengths.
Paladin // Bard: All good saves, most abilities key of Charisma, huge spell list for charged items, lots of skill points, good HP, full BAB, and bardic music enhances your melee.
Ranger // Psion: All good saves, archery style as backup if your Powers aren't working, lots of skill points, decent HP, full BAB, eventually Evasion.
Rogue // Cleric: Again, all good saves, Evasion, great self & party buff spells, great skill points & skill list, amazing spell list (including silence and, if he takes the Trickery domain, also the invisibility spells), decent HP, and spells which boost you up to full BAB. If you allow access to Spell Compendium, then gravestrike all by itself is a very good reason for this combo.
With those three class combos, they'll survive just fine. (As the DM, you'll have to bend the rules a little to let the Paladin//Bard be a LG Bard, of course.)
Cheers, -- N