I've been playing a lot of this over recent months, mainly on PC but also a bit on XBOne. I think it's a brilliant game, somehow the FH series captures what I want in racing games, arcade handling but still with a good depth vehicles, upgrades, tuning etc. Haven't done a bullet review on here for years so here goes:
+Performance is really good, plus it has a good benchmark showing whether you are cpu or gpu limited, and settings labelled as to whether they impact cpu or gpu. Great example of something developed well for the PC.
+Decent graphics
+LOADS of content, without getting too repetitive. I enjoyed doing most of the story missions (have completed them all except Skill Streak), it adds a bit of humour and LaRacer had some nice throwbacks to old games. It's getting to the point where I've exhausted most of the content but I've put dozens of hours into the game. Some of the seasonal challenge events have also helped freshen things up and give me something to work for.
+Great range of cars, to the point of being almost overwhelming. I think I've got about 450 cars but there's probably only about a dozen that I've driven for any length of time. I tend to use the Jesko for pretty much everything except drift or where it isn't eligible.
+Nice range of environments from town centre to countryside to beach, plus Lego speed champs / Fortune Island
+Crossplay with XBOne is nice, sometimes I will play with my son in the living room.
+I like how races and challenges are blended into the game world, so you get familiar with various sections, and tick off various jumps / speed traps etc as you cruise around
-As with other FH games I'm still not completely sold on the way difficulty scales with PI rating i.e. if you upgrade your car then you race faster opponents. There are some races where the best strategy seems to be to pick a slower car so you face slower opponents but you have a slightly easier race because you aren't going as fast. On the one hand this mechanic does encourage me to try a wider range of cars than I otherwise might, but it also takes away the option of trying a race with a car and then upgrading or replacing it if you are struggling (which is what I did in e.g. GT5). The only exception I guess is the X rated cars where you never seem to face X rated opponents so do get a genuine advantage.
-It's annoying in story missions that you sometimes don't get to see the 3* target until you have hit the 2* target (e.g. for drift/skill points). This means you have no idea what you ultimately need to get, so you don't know whether you need to risk not making the time limit by engaging in excessive drifting early on or not
-Some of the menus aren't the most intuitive, it feels a bit like a mish-mash of random tiles chucked together on various tabs, and it's not clear to me why certain things are only accessible at your house/garage (given you can fast travel, and have cars delivered to you) - just seems to add unnecessary faff. "Horizon Life", "Forzathon" "Online Adventure" etc I have no idea what all these different things really are. Then you get spammed with notifications for business payouts etc that I haven't seen an obvious way to suppress yet. Auctions are annoying, if you list a car and it doesn't sell there is no easy "Relist" button that lets you put it back up for sale perhaps with a tweaked price. On the map, there is no option to filter out "Completed" events, you can choose "New" but that doesn't seem to necessarily give you all uncompleted events.