I'm actually new to Dragon Age:Inquisition. I'm a (probably soon-to-be-ex) World of Warcraft player. Played it for 9 years, but the latest release just got to me. It was so dumbed down that I did have the problem the OP stated he had - mashing 2-3 buttons for most of a fight. The difference being it's pretty much like that in all end-game content of Warcraft.
First off the bat, I am amazed by this game. It's aimed at adults, and I don't have moronic 10 year old kids shouting homophobic, racist, sexist slurs and any other insult they can think of, thiinking they are tough. I love the occasional cuss words, the romance, relationships, and the blood. I love seeing my character covered in blood after a fight. (Geez, one smiled and had blood on their teeth. That's really going all out...). The realism as well, compared to the cartoon look of Warcraft is amazing.
Having said that, I'm confused that you get limited to 8 skills, despite having more to choose from. Why are there no keybinds, macros, extra toolbars, etc? Friend said it was so console players could play, and they only have 8 buttons. if so, it's a bit silly to me. Making games for consoles AND PCs is never going to work, as PCs need the games dumbed down to run, and consoles never have the grunt to play to fiull effect. But other than that, I do see a lot of replayability in the game, and this as someone who came from a farm/grind gaming background that is limited as well only by how you play it.
I think I played DAO at least 10-12 full play-throughs. It was barely all I could do to get through 2 of this game. Now on my 3rd (archer) and now realizing I'll not have access to many abilities til late in the game, the idea of spamming the same 2-3 abilities over and over is too boring.than a few buttons at a time.
Try playing World of Warcraft now and realise you have the same 2-3 abilities (from a best total of 25 in the early days, down to 10) and do repetitive grinding and farming day in and day out, and tell me which is boring. Try doing a 25 man raid that lasts for 4 hours using only the same 2-3 attacks/spells every fight and occasionally popping a proc speciality and tell me that's not boring. And honestly, if a scrub n00b like me can come from WoW and play a rogue using all 8 skill slots and still need more, a veteran like you should have no trouble.