I would have thought you could join in an inspection visit.
It's just that when we came to sell our house, it was riddled with damp at the back, due to a blocked gutter - there was black mould all round one of the back bedroom windows and it looked quite squalid. This was 2 months after we'd received an inspection report giving the status of each room in the house, specifically saying there was no damp present in any room. The tenants were subletting that room to someone outside the family who'd put a bolt on the door (which we'd asked the agent not to permit, it was supposed to be kept as a family home), so they clearly hadn't been in to inspect that room at all. We weren't living locally at the time, and were paying a lot of money for what we thought was a good service from a highly reputable agency.
The first we knew was when our buyer dropped his asking price on the surveyor's recommendation - we obviously should have sued or otherwise sought compensation from the agent, but our circumstances at the time made it less of a priority than it should have been and we were just relieved that we sold the house quickly.
A friend in another part of the country had her beautifully-restored Victorian terraced cottage painted throughout in strong, dark colours, including the painstakingly-stripped woodwork. When she complained to the agent, they asked her to prove that this wasn't the way the house was decorated originally.
So, take photos before you let, make sure the inventory reflects the decorative state (ours did that), and keep an eye on it yourself if possible.
Sorry to be negative, it'll probably be fine for you, but either keep an eye on things yourself, or ask plenty of questions before you choose an agent.