Hard to be specific given the details but here are some guidlines we use when looking at websites
Revenue and client numbers if a ecommerce type of site-- if your interest is VC backing understand there is little interest in sites that could be nice 10 or 20M business'. The financial model usually does not work. and I would say that today (as opposed to 5 years ago ) if you need more than a few hundred K to get a good site off the ground something is askew... and for 250-500K your answer should be angels not VCs. The site has to be the front end for a business. (think UBER). The site is probably not the business.
If its an aggregator site... meaning we build a user base and try to leverage that base as marketing or advertising or similar models... don't show up unless you have 500K or 1M user base.
along with the basics..
- management team and their mindset to pivot and move on if required.. breadth... its alot more than just a good web developer and good idea guy... in particular for something (like web) that has to scale..
- web vs mobile... most creative things seem to be mobile based not web based... especially given the phablet phenomena
- uniqueness and ability to sustain differentiation... alot more than no one else is doing this...