Ok, I don't know a lot about a lot, but I do know about potato dauphinoise and enough people have expressed dismay at how their dauphs have turned out - 'practically raw' 'bland' and so on, for me to write about it.
The trick is to bung a LOT of salt and pepper and garlic inbetween your layers of potato. More than you think you need. A good sprinkle of salt, a good four twists of the pepper grinder and at least half a clove of garlic, chopped or microplaned.
Then you must, must, cook the sucker for ages. Like, two hours. You can just about get away with 1.5 hours if your oven is top-class. But nothing bad will happen if you blast it for 2 hours, so just throw it in there and forget about it.
A good dauph is the best thing ever, but it's not worth making an average one.