Obviously, there will be some products that viscerally excite you and others that don't, but let me elaborate: perhaps a company is working on a tool to help construction workers orchestrate cleanups at their work sites...or the company is working on a platform to help automate property management...whatever.
These may not seem as exciting, on the surface, as other products you may have seen out there, but it could be that digging into them further there are elements which will pique your interest. For example, perhaps the systems that need to be built in support of these products are particularly complex or they present particular scaling challenges, etc.
The underlying product may not be super interesting to you, but it could be that the engineering work involved in them is actually more interesting than some other product that feels more exciting to you. Or perhaps the business or operations side of these companies is very interesting and well-executed and there are things to learn on that front.
I'm not expressing this very well, but my main point is that there can be a divergence between products that are interesting and work that is interesting - often times the less exciting product presents more interesting/challenging work. To see that, you need to take into account the entire equation: the biggest challenges the company is facing, the long-term strategy, how sharp the business/ops side of the company is, etc.
Keep an open mind; things that, at first glance, don't seem interesting may turn out to involve _very_ interesting/rewarding work.