It is a great game , it hasn't the troll WoW has, work fine since beta , well polished, has constant updates and lots and lots of content.

Regarding the instances , the higher the lvl , the more complex the mechanics on bosses are. So at start , as the tanks dont have the most efficient spells/skills , the bosses will be more easy to counter. The mob groups wont be that larger and they wont dead too much damage to players. But still those dungeons have their own cool things to share. For example the Iron Tomb has a great part where you need to stick to some orbs that light the darkness there and the shadows that attack you will take more damage. You will need o run from one orb to the other and pay attention cause the longer you stay in the darkness the more shadows you will attract.

Later in Stone Field , Deepstrike Mine gets a bit more complicated as every boss hase one mechanic. So the progress is smooth and players wont get frustrated.

Another great thing that makes you get into the dungeons its related to the gear. Every piece there has some stats that you wont find in the open world or at vendors. So you can level up without trying to visit those dungeons or you can go there , get the gear and have a easy life in pve and keep your shards for other things. But this is optional as many things in the game.

The souls system is brilliant. You can have any combination you want and here is the challenge for the best spec. You can counter anything , the ballance aint a problem anymore and free choice makes you feel that your decisions count

Also for the PVP part there is a special soul that you will put point in but is related to your pvp level. This is something new alone with the fact that you can have up to 4 saved combinations of souls and you can change them accordingly to the situation.

Invasions = hundreeds of mobs + hundreeds of players + world chanhes ----> lag free!!! First time I see this in an MMO. Don't know how they do it but it is incredible and I love it!

Late game there are lots of things to do as you have expert rifts , expert dungeons , raids etc. You can start the artifact hunting or simply go for PVP. There is allways something to do , the world is huge and the choice is yours.

My opinion : Rift , without too much yelling in the press, its the only MMO that can be an option to the WoW players. Its great , big , polished , lag free , has great graphics , lots of content ,no trolls and dedicated support that seem to work 24/7.