Pathfinder is a pretty good system; it's essentially D&D 3.5, but tweaked and improved. I've been playing it on-and-off for a couple of years now. Our group is 5/6 of the way through the Mummy's Mask campaign (Egyptian stuff, loads of traps, sphinxes and undead). I've also played about half of the Hell's Vengeance campaign, which is a evil campaign, where your party are essentially all lawful evil and trying to gain power and favour in Cheliax (a very, very evil empire)
It's a really big game in terms of character options and ability interactions. You can make some
seriously complex race/class/spell combinations for example. I went with Paladin for Mummy's Mask, which is fairly straightforward. Essentially you're a combat class, but with some fairly cool divine powers swapped in, and restrictions on your behaviour (which are partly dependent on the deity your character worships, and partly how pragmatic your GM is).
For Hell's Vengeance, I went with Inquisitor, which is another divine class, but is much more generalist. It has good skills, and decent magic (which can be used with armour because they're divine) and solid saving throws. They also have the ability to use teamwork feats without other players in the party having them, making them
really good as a backup to your party's main melee character, as well as having the ability to give themselves specific additional bonuses during combat. There's very little they can't do, but they can't take on specialist classes in in their own field (they'll get massacred in melee against a Fighter for example).
Personally, I find working out all the levelling stuff
really difficult, but thankfully the other folks in our group know the system. One thing I've found is that a lot of feats are utterly worthless. But it's also really difficult at times to work out which those are.
Sites like
RPGBot are really useful for working out what does and doesn't work - because the game doesn't do a very good job of pointing those out. Also, bear in mind that some feats that may be garbage for most campaigns can be
massively useful in certain specific campaign settings. In Mummy's Mask, feats that give bonuses in deserts are hot weather are potentially really useful, but will be worthless in literally
any other campaign.