So, I rather like the idea of a priest of Tyr in the context of the 'canon' party. It just seems highly appropriate to me that Minsc can be calmed by a priest of the god of Righteous buttkicking justice.
Exaltation is great. Fantastic ability. Well balanced and does a cool thing that nothing else does.
It's Divine Favor I'm having trouble talking myself into. It's not the bonuses, they seem reasonable and well balanced. It's the duration. If you are careful, you get two attacks with +1 to hit and damage +1 every third level. If you accidentally use the ability after your attack for the round (very easy to do with its low cast time) you get one attack with those bonuses. Once per day. Up to 3 in ToB.
I get the idea, It creates an image of a careful warrior aiming his slow and methodical blows to best effect. Cool stuff, it creates a cool dichotomy in the obvious comparison with the Boon of Lathanderp, which grants an extra attack, which is oddly suitable for the frenetic meddling deity responsible for the Dawn Cataclysm and various other shenanigans.
It's just very difficult to square the efficacy of Divine Favor with the known quantity of asskickery gained by the Priest of Lathanderp. We all know and love what the Boon brings to the table. When you crunch the numbers, it's not just better (which would be fine) it's miles and miles ahead, providing saving throws and a useful immunity in addition to damage, thaco, and that coveted extra attack. In theory, the powers should be broadly equivalent in power since they fill the same "slot" of a 1/day per 10 levels power. They aren't.
Off the top of my head, Divine Favor has decent synergy with shapeshifting forms that grant extra attacks (Relair's Mistake, Cloak of the Sewers, Slayer Form) and with Energy blades. The extra damage really shows its stuff when you can crank up the APR. The problem is that a reasonable cleric will only ever have 1 barring exceptional circumstances. I reckon it also makes it easier to land touch spells, though I am leery of how impactful this would be.
I really wish it lasted a full turn, as the 3e version does. Not complaining, per se, just looking for applications of divine favor that make the most of its serious shortcomings. I want to feel like a crusader for Tyr's buttkicking justice, not just Minsc's halfling therapist.