If you want to hear a first hand account of the Harriers performance rather than third hand rumours and speculation I suggest you read "Sea Harrier over the Falklands" by Commander Nigel 'Sharkey' Ward, who commandded 801 Naval Air Squadron flying from HMS Invincible during the campaign. You'll find it quite an eye opener.The Harrier in all its variants can be a handful to fly but the pilots who do so wouldn't swap it for anything else around at the moment. The F-35B will solve the handling problems of the Harrier in vertical flight by using a lot of computing power to stabilise the aircraft, leaving the pilot free to guide the plane gently down to a landing for example. This technology has already been trialled in a two seat Harrier known as the VAAC and works very well. If it were retro fitted to harriers the accident rate would decline considerably but a retrofit is unlikely as the harriers are due to phased out in the next few years as the F-35B becomes available, and also the computers take up a significant volume within the airframe. The F-35B is a larger airframe than the Harrier and has been designed to accomodate the Computers from the start.
When the US Marine Corp introduced the AV-8A into service in 1970 the first squadron had a near spotless record for safety, but then it was made up of qualified test pilots (the best of the best) who reported the aircraft as very stright forward to fly (it was for them) and this lead the USMC to believe no special standard for pilot competence over and above the normal level was required. So they started to post ordinary pilots to Harrier squadrons including helicopter pilots, reasoning they would be better able to cope with the vertical flight regime. They were very good at hovering the Harrier, it was just the flying forward at 500 knots they had trouble with and more than a few drove their planes straight into the side of mountains and othe examples of 'cumulo granite' simply because they didn't have the currency for fast jet ops. This is the USMCs own account of the accident rate in the 70s, and the accident rate since has as much to do with the high utilisation rate of the harrier as anything else. The AV-8B+ has the same radar/attack system as the F-18A/B and performs equally well in combat, but the Hornet cannot operate from LHAs/LHDs, which is why the Harrier is still in service with the USMC.
Most criticism of the harrier tends to come from countries that don't have it or from services that feel threatened by its success, and remember the Harrier is a combat proven aircraft, and thats what it was designed for, making large and expensive holes in the enemies installations and inventory, and shooting down aircraft twice as expensive as it is. A lot of 'experts' have dismissed the harrier from day one and continue to do so, but the best definition of an expert I have ever heard came from John Fozzard, one of the Harriers designers; "Ex is a has-been and spurt is a drip under pressure."